Guide to the Ray Dolby papers M2959
Rebecca M. Gordon
Department of Special Collections and University Archives
June 2024
Green Library
557 Escondido Mall
Stanford 94305-6064
Fax Number: (650) 723-8690
specialcollections@stanford.edu
Contributing Institution:
Department of Special Collections and University Archives
Title: Ray Dolby papers
Creator:
Dolby, Ray Milton
source:
Dolby, Dagmar
Identifier/Call Number: M2959
Physical Description:
18 Linear Feet
(28 manuscript boxes, 7 flat boxes, 11 map-folders)
Date (inclusive): [c. 1940s - 2000s]
Abstract: Biographical and research files, correspondence, publications, and assorted materials from the life and career of American
audio engineer Ray M. Dolby, covering his education from high school through his doctoral studies at Cambridge University,
his employment as a young man at Ampex where he contributed to the development of the first videotape recorder, and the founding
of Dolby Laboratories in London, later headquartered in San Francisco. Materials in the collection include Dolby's schoolwork,
circuit drawings and engineering schematics for work both at Ampex and Dolby Laboratories, research notes and calculations,
patents, correspondence, ephemera from Ampex and from the early years of Dolby Laboratories, and photographs.
Physical Location: Special Collections and University Archives materials are stored offsite and must be paged 36 hours in advance.
Language of Material:
English
.
Conditions Governing Access
Open for research. Note that material must be requested at least 36 hours in advance of intended use.
Immediate Source of Acquisition
This collection was given by Dagmar Dolby to Stanford University, Special Collections in October 2023.
Arrangement
The collection is arranged into five series:
1. Biographical Files, 1946-2024
2. Ampex/VTR, 1949-2007
3. Research Files, Cambridge University, 1957-1965
4. Dolby Laboratories Business Files, 1963-2010
5. Design Drawings, Schematic Diagrams, and Artifacts, 1949-1988
Biographical / Historical
Ray Milton Dolby was an American engineer whose inventions and company, Dolby Laboratories, have had a profound effect on
the storage, transmission, and reproduction of audio and video.
Born in Portland, Oregon in 1933, Ray Dolby grew up in the area that later became Silicon Valley. In 1949, as a 16-year-old
student at Sequoia High School in Redwood City, Dolby had a chance encounter with Alexander Poniatoff, founder and President
of Ampex Corporation, which had recently introduced the first U.S.-made professional audio tape recorder. This led to Dolby's
working at Ampex for the next eight years, full-time when he could and part-time when in school at Sequoia and, later, San
Jose State College. Dolby contributed to various audio and instrumentation projects, and from 1952-1957 he was mainly responsible
for developing the electronic aspects of the Ampex video tape recording system (VTR), the world's first practical video tape
recorder. Dolby continued to develop new ideas for the VTR even during a stint as an electronics instructor in the US Army
from 1953-55. The Ampex video tape recorder was first demonstrated in April 1956, and quickly revolutionized broadcast television.
Dolby shared in the 1957 Emmy awarded to Ampex for its invention.
Returning to Redwood City after his army service, Dolby enrolled at Stanford University completing a B. Sc. in electrical
engineering in 1957. That same year, after being awarded a Marshall Scholarship followed by a National Science Foundation
graduate fellowship, Dolby left Ampex for further study at Cambridge University in England. His research at Cambridge's Cavendish
Laboratory made it possible to determine the chemical composition of light elements such as oxygen by adapting X-ray bombardment
techniques that had been used previously for heavier elements like iron. He was awarded a PhD in physics in 1961 and was elected
a Fellow of Pembroke College (Honorary Fellow, 1983). During his last year at Cambridge, he worked as a consultant to the
United Kingdom Atomic Energy Authority. In 1963 he joined a program in India sponsored by the United Nations Educational,
Scientific, and Cultural Organization (UNESCO) and became a technical adviser. Relocated to Chandigarh in the state of Punjab,
he analyzed India's electronic scientific instruments industry and suggested improvements. He returned to England in 1965
to establish Dolby Laboratories in London.
While in Cambridge, in 1962, Ray Dolby met Dagmar Baumert, a language student from Frankfurt, Germany on exchange from Heidelberg
University. She joined Dolby in India, and the two married in London in 1966.
As a hobby in Cambridge and in India, Dolby would experiment with making live tape recordings of local musical performances.
Doing something about tape noise had intrigued him since his time at Ampex, and as he studied existing companders (compression/expanders),
which added more distortion than they reduced noise, Dolby discovered a solution. Tape noise is only audible on quiet passages
and is electrically a very small portion of the whole signal. It could be possible to have a separate path to process only
those small signals while letting the loud sounds pass through undisturbed. Low level processing could be applied separately
to each of four frequency bands, thereby eliminating another weakness of existing systems, noise modulation. In 1965, during
a two-month overland drive back to the UK with Dagmar through Pakistan, Iran, Iraq, Syria, Jordan, and Turkey, Dolby took
time during a stop in Afghanistan to write up his ideas and send them to Paul Flehr, his patent attorney in California. This
became United States Patent 3,631,365 for a "Frequency selective, symmetric signal compression expander," which was the essential
patent for Dolby noise reduction. The patent application was filed in October 1969 and granted in December 1971.
Dolby opened Dolby Laboratories in May 1965. He first developed a monochrome video noise reduction system which the BBC evaluated,
but chose not to pursue because the BBC was then converting to color. Instead, Dolby developed the A-type audio noise reduction
(NR) system and embodied it in the Dolby A301 NR unit for use in professional music recording. Decca Records was Dolby's first
customer. After months of testing, Decca found that the A301 not only provided significant noise reduction (on the order of
10 db), but that the device did not introduce any side effects. Decca ordered the first nine Dolby A301 units, along with
exclusive use of the technology for three months.
In 1967, at the urging of U.S. stereo manufacturer Henry Kloss, Dolby committed to developing an NR system for consumer products,
which became known as Dolby B-type. The Dolby B consumer noise-reduction system works by compressing (boosting) low-level
high-frequency sounds during recording and expanding (decreasing) them symmetrically during playback, which also decreases
inherent tape noise. Like the A-type, Dolby B-type uses dual paths, but with B-type, lower-level signals are processed within
a single sliding band of higher frequencies that stands in for the multiple fixed stands of A-type NR. This reduces the audible
level of tape hiss. In 1970 the first cassette recorders with Dolby B-type were introduced, and became popular immediately.
Applications from manufacturers for licenses to use Dolby technology multiplied. Ultimately the compact cassette encoded with
the Dolby B-type became a ubiquitous recorded music medium.
After his pioneering work with audiotape noise reduction, Dolby sought to improve film sound, specifically the limited fidelity
optical soundtrack on 35mm movie prints. The first film with Dolby sound was A Clockwork Orange (1971), which used Dolby noise
reduction on all pre-mixes and masters, but a conventional optical sound track on release prints. Callan (1974) was the first
film with a Dolby-encoded optical soundtrack. The first true LCRS (Left-Center-Right-Surround) soundtrack was encoded on the
movie A Star is Born in 1976. In fewer than ten years, 6,000 cinemas worldwide were equipped to use Dolby Stereo sound.
By 1980 Dolby B-type NR had been established in cassette recording for ten years. Anxious for something new, several Dolby
licensees in the industry pressed for a more powerful consumer NR system. Dolby introduced C-type NR, which further reduced
tape hiss by 20dB versus B-type's 10dB.
Developing C-type rekindled Dolby's ideas for a new professional system, partly impelled by the high cost and reported unreliability
of the professional digital audio recorders then coming on line. Dolby believed he could bring to existing analog recorders
signal quality at least as good as digital, but with greater reliability and at far lower cost. To free himself for this project,
in May 1983 Dolby stepped down as president of Dolby Laboratories and promoted Bill Jasper, then the company's financial vice
president, to president. Ray Dolby became Chairman.
For the next four years, Dolby combined everything he had learned including both the multiple fixed bands of A-type NR and
the sliding-band technology of B-type to develop his ultimate analog recording process. As well as dramatically more noise
reduction, Dolby incorporated developments that significantly improved analog's high-level signal capacity. The net increase
in dynamic range was so great that Dolby named the new system Spectral Recording, or Dolby SR. The professional Type A system
operates on four different frequency bands, and the final SR (Spectral Recording) system, developed in the 1980s, on ten.
Dolby Laboratories then developed a digital surround sound compression scheme for cinema. Dolby Stereo Digital (Dolby Digital)
was first featured on the 1992 film Batman Returns. Dolby Digital uses five main audio channels (front left, front center,
front right, rear left, rear right) and one subwoofer channel, and is often called Dolby 5.1 channel digital audio.
In addition to being an innovator in the fields of professional sound recording equipment, cinema sound systems, and consumer
electronics, Ray Dolby was a business practices pioneer as well. His facility for writing patents became legendary, and the
licensing practice that Dolby Laboratories invented has become a standard across several industries.
After moving his company to San Francisco in 1976, and as Dolby Laboratories became increasingly successful, Ray Dolby became
one of the city's leading philanthropists. Dolby donated generously to and served on the boards of the San Francisco Symphony
and the San Francisco Opera. Ray and Dagmar Dolby have also donated generously to the University of California San Francisco,
to Ray Dolby's alma mater Stanford University, and to Cambridge University's Pembroke College and Cavendish Laboratory.
During the last few years of his life, Dolby was diagnosed with Alzheimer's disease. Ray M. Dolby died of acute leukemia in
2013.
Dolby held over fifty U.S. patents. He was a fellow of and past president of the Audio Engineering Society (AES).
Public recognition for Ray M. Dolby's inventions have included a US National Medal of Technology, two Oscars for scientific
and technical achievement, several Emmys, a Grammy, an honorary OBE (Order of the British Empire), and a posthumous star on
the Hollywood Walk of Fame, installed in 2015.
Preferred Citation
[identification of item], Ray Dolby papers (M2959), Dept. of Special Collections and University Archives, Stanford Libraries,
Stanford, Calif.
Related Materials
Ampex Corporation records (M1230)
https://searchworks.stanford.edu/view/4688789
Ampex Historical videorecordings (MSS MEDIA 0014)
https://searchworks.stanford.edu/view/4688789
Crosby-Mullin B-42 (pre-Ampex video machine) slides and ephemera, circa 1985 (MISC 2204)
https://searchworks.stanford.edu/view/13454909
Florence James collection of Alexander M. Poniatoff and Ampex Corporation papers, 1964-1978 (M1728)
https://searchworks.stanford.edu/view/8448813
George K. Durfey collection of Ampex Museum photographs (MISC 1059)
https://searchworks.stanford.edu/view/4737643
Joe Roizen film archive (MSS MEDIA 0017)
https://searchworks.stanford.edu/view/6688521
Neal Kyser McNaughten papers, 1951-2001 (M2586)
https://searchworks.stanford.edu/view/13973756
Stanford Archive of Recorded Sound Ampex holdings:
Ampex Collection Addenda (ARS0109)
https://searchworks.stanford.edu/view/9323720
Richard Hess Mullin-Palmer Tape Restoration Project Collection (ARS0035)
https://searchworks.stanford.edu/view/6745997
Scope and Contents
The Ray Dolby papers contain materials from and about Ray M. Dolby (1933-2013), pioneering American audio engineer. In addition
to personal and professional materials pertaining to Dolby's time at Ampex Corporation, his establishment of Dolby Laboratories,
and the development of an audio noise reduction system, the collection includes papers from Dolby's studies at Stanford and
Cambridge Universities, correspondence from his time as a UNESCO technical adviser in India, research notes and publications,
trade publications, circuit drawings and schematics, memorabilia, patents, and photographs, in particular photographs of Ampex
personnel in the 1950s and subsequent celebrations, and of the X-ray microanalyzer at Cavendish Laboratory, Cambridge University.
Some objects notable for their use of the Dolby logo are also included.
Conditions Governing Use
While Special Collections is the owner of the physical and digital items, permission to examine collection materials is not
an authorization to publish. These materials are made available for use in research, teaching, and private study. Any transmission
or reproduction beyond that allowed by fair use requires permission from the owners of rights, heir(s) or assigns.
Subjects and Indexing Terms
Sound -- Recording and reproducing
Electrical engineering
Dolby, Dagmar
Series 1. Biographical Files, 1946-2024
Scope and Contents
This series contains materials pertaining to Dolby's personal life, school work, education, time spent in India working for
UNESCO, records from his period as president of the Audio Engineers Society, various awards, correspondence, and miscellany.
The series also contains pictorial family biographies and a biography of Ray Dolby written by Peter Cowie and edited by Dagmar
Dolby.
Box 1, folder 1
Childhood Inventions & Projects
2009-12-11
Box 1, folder 3
Letters of Recommendation (for summer job at Yosemite)
1948
Box 1, folder 4
Sequoia High School "Young Ideas" literary journal
1951
Box 1, folder 5-7
Dolby's Jr/Sr High School Schoolwork
1949-1951
Box 1, folder 8
"Atomic Bomb" essay and research
1950
Box 1, folder 9
High school memorabilia (diploma, graduation ephemera)
1951
Box 2, folder 1
San Jose State College coursework
1951-1955
Box 2, folder 2-3
University of Tennessee Extension coursework
1954
Box 2, folder 4
San Jose State College coursework
1954-1955
Box 3, folder 1
Stanford Univ. "Western Civ, History 10"
1955
Box 3, folder 2
Stanford Univ. "English II B"
1956
Box 3, folder 3
Stanford Univ. "Western Civ II, History 11"
1956
Box 3, folder 4
Stanford Univ. "Electromagnetic Theory 270"
1956
Box 3, folder 5
Stanford University coursework
1956-1957
Box 3, folder 6
Stanford Univ. "Engineering Economy"
1957
Box 3, folder 7
Stanford Univ. "Transmission Lines - Electrical Engineering 117"
1957
Box 3, folder 8
Stanford Univ. "Humanities 22: World Personalities"
1957
Box 3, folder 9
Stanford Univ. "Electrical Engineering 161: Electronics"
1957
Box 4, folder 1
Stanford Univ. "Class Notes, Complex Variables, Math 106"
1957
Box 4, folder 2
Stanford Univ. "Complex Variables Homework"
1957
Box 4, folder 3
Stanford Univ. "Scientific Writing, English 129"
1957
Box 4, folder 4
Stanford Univ. "Electronics 162" coursework
1957
Box 4, folder 5
Stanford Univ. "Fluid Mechanics CE 106" coursework
1957
Box 4, folder 6
Stanford Commencement and Diploma
1957
Box 4, folder 7
Education miscellaneous
1950-1957
Box 4, folder 8
"List of College Courses Taken 1951-1957"
ca. 1957
Box 4, folder 9
Marshall Scholarship, A. Poniatoff Recommendation Letter
1956
Box 4, folder 10
Marshall Scholarship, photocopy of clipping from Ampex Monitor
1957 October 11
Box 4, folder 11
Cambridge Univ., Physics Notes
1957-1959
Box 4, folder 12
"Interesting Ideas 1960"
1960
Box 4, folder 13
Cambridge Univ., Fascimile, Doctor of Philosophy
1961 December 16
Box 4, folder 14
Pembroke College, Cambridge Univ. Thank-you notes
1970 February - June
Box 4, folder 15
Pembroke College Cambridge Society memorabilia
1961-1975
Box 4, folder 16
Association of Marshall Scholars & Alumni materials and newsclipping
1968-1973
Box 4, folder 17
Pembroke College, Cambridge Univ. Honorary Fellowship
1983
Box 5, folder 1
UNESCO pamphlets, newsclipping
1959-1962
Box 5, folder 2
UNESCO/United Nations Programs of Technical Assistance pamphlets
1960-1962
Box 5, folder 3
UNESCO Information Manuals and Briefing Information for "International Experts"
1962
Box 5, folder 4
Science Instruction Teaching Guides/Film Catalogs
1961
Box 5, folder 5
Correspondence, legality of live recordings
1962
Box 5, folder 6
Correspondence, Requests for reprints of X-ray microanalysis paper
1963-1964
Box 5, folder 7
Correspondence, Dolby & Ampex re: equipment orders
1958-1962
Box 5, folder 8
Correspondence, Leaving India and CSIO business
1964-1965
Box 5, folder 9
UNESCO organizational info & miscellaneous
1963-1964
Box 5, folder 10
Correspondence, Leaving India travel arrangements and CSIO admin
1964-1965
Box 5, folder 11
Correspondence, India re: VW, sound recording equipment, misc.
1963-1964
Box 5, folder 12
Correspondence, CSIO business, Dolby and Ramanathan, Kris
1964
Box 5, folder 13
Correspondence, Dolby application & appointment to UNESCO/CSIO (Central Scientific Instruments Organization)
1962-1963
Box 5, folder 14
Correspondence, misc. (inc. offer of research appt. at USC)
Box 5, folder 15
Correspondence, UNESCO admin and separation
1964-1965
Box 5, folder 16
Correspondence and miscellaneous, UNESCO
1963-1967
Box 6, folder 1
Correspondence, Pickfords and Cox & Kings, relocation services
1963-1965
Box 6, folder 2
Info re: cost of living & living conditions in India
1959-1961
Box 6, folder 3
Indian newspapers in English
1964 July - November
Box 6, folder 4
UNESCO CSIO (Central Scientific Instruments Organization) papers
1963-1964
Box 6, folder 5
Correspondence and reports, UNESCO CSIO
1963-1965
Box 6, folder 6
Correspondence, UNESCO CSIO Chandigarh, India, internal
1963-1964
Box 6, folder 7
"The Importance of Simplicity in the Design of Electronic Instruments," paper delivered in New Delhi
1963
Box 6, folder 8
Correspondence re: Dolby's Volkswagen and overland travel plans
1963-1964
Box 6, folder 9
Japan trip, camera info, visit to Hitachi
1965
Box 7, folder 2
AES (Audio Engineering Society) conference programs
1967-1969
Box 7, folder 3
AES (Audio Engineering Society) press featuring Dagmar Dolby
1974-1975
Box 7, folder 4
Pro Sound News spotlight featuring Ray Dolby, president, AES
1981 May
Box 7, folder 5
Journal of the Audio Engineering Society, president's message from Ray Dolby
1980 December
Box 7, folder 6
AES convention questionnaire summary and financial report
1981 October 23
Box 7, folder 7
AES speeches and notes (Ray Dolby, president of AES)
1980-1981
Box 7, folder 8
AES Awards banquet programs and planning notes
1981-1983
Box 7, folder 9
AES Awards letters, to and from recipients
1983
Box 7, folder 10
AES Awards Committee background material
1980-1982
Box 7, folder 11
AES Awards Committee info to Barry Blesser
1983 November 16
Box 7, folder 12
AES Awards, working file
1981-1983
Box 7, folder 13
AES proposals for 1984 convention
1981-1984
Box 7, folder 14
AES Business for October 1983 Board Meeting
1982-1983
Box 8, folder 1
AES business, Eindhoven, Netherlands 1983
1982-1983
Box 8, folder 2
AES 1986 Annual Convention on audiocassette - list
1986
Box 8, folder 3
AES Convention Reduction, 1983
1980-1981
Box 8, folder 4
AES Convention Reduction poll papers
1981
Box 8, folder 5
AES Nominations Committee
1981-1983
Box 8, folder 6
AES Board of Governors meeting minutes, Eindhoven, Netherlands
1983 March
Box 8, folder 7
AES Convention Reduction, 1984 (correspondence)
1981-1984
Box 8, folder 8
AES correspondence
1981-1982
Box 8, folder 9
AES Convention Reduction, phase 2
1981-1983
Box 8, folder 10
Heyser Committee (AES committee on conventions)
1983
Box 8, folder 11
Responses to AES Convention Reduction questionnaire
1981
Box 8, folder 12
Convention numbers, "stay at two" (responses to convention reduction questionnaire)
1981
Box 8, folder 13
Convention reduction, "cut back to one" (questionnaire responses)
1981
Box 8, folder 14
Convention reduction correspondence
1983
Box 8, folder 15
AES Board Meeting in Los Angeles
1981 May
Box 9, folder 1
AES miscellaneous Executive Committee material
1981
Box 9, folder 2
AES miscellaneous correspondence
1981
Box 9, folder 3
AES NY 1981 Board Meeting Business
1981
Box 9, folder 4
AES Journal editorial, Ray Dolby, President
1980 December
Box 9, folder 5-6
AES Board of Governors Meeting, Los Angeles (transcription)
1981 May 14
Box 9, folder 7
AES Board of Governors Meeting, Los Angeles, agenda and reports
1981 May 14
Box 9, folder 8
AEs Board of Governors Meeting, NYC
1981 October 31
Box 9, folder 9
AES 1995 Convention, NYC, miscellaneous
1995 October
Box 9, folder 10
AES 1996 Los Angeles exhibit prep and miscellaneous
1996
Box 9, folder 11
AES 1996 Copenhagen Convention (100th AES), miscellaneous
1996
Box 9, folder 12
AES 1997 New York, miscellaneous
1997
Box 10, folder 1
Audio trade magazines
1968-1969
Box 10, folder 2
Audio trade magazines
1970-1972
Box 10, object 3
Audio trade magazines
1973
Box 10, folder 4-5
Trade product packets and marketing ephemera
1970
Box 10, folder 6
Reviews of Dolby equipment and miscellaneous (inc. WFMT radio guides)
1969-1971
Box 10, folder 7
Clive Sinclair Transistor Audio Amplifier Manuals
1961-1962
Box 11, folder 1
AES publications, Journal of the AES volume 57 no 7/8
2009
Box 11, folder 2-5
AES publications, 1995 Convention Preprints
1995
Box 12, folder 1-2
AES publications, 1996 Convention Preprints
1996
Box 12, folder 3-5
AES publications, 2003 Convention Preprints
2003
Box 12, folder 6
Society of Motion Picture & Television Engineers (SMPTE), miscellaneous
1956-1982
Scope and Contents
Includes April 1957 Vol. 66, no. 4 Journal of the SMPTE containing articles on the Ampex Video Tape Recorder written by C.
Ginsburg, C. Anderson, and R. Dolby
Box 13, folder 1
Honor requests, American Academy of Achievement
1978-1982
Box 13, folder 2
Awards and Honors, 1990 Grammy Awards
1990 February 11
Box 13, folder 3
Awards and Honors, Technical Excellence & Creativity (TEC)
1991
Box 13, folder 4
Awards and Honors, Ampex going-away poem
1953 March 18
Box 13, folder 5
Awards and Honors, Who's Who 2010
2010
Box 13, folder 6
Awards and Honors, various
1986-1996
Box 13, folder 7
Ray Dolby c.v., awards, and bios
1957-2003
Box 13, folder 8
Correspondence, misc. (inc. thank-you letter and autograph request)
1981-1983
Box 13, folder 9
Professional recommendation for Marvin Camras for National Academy of Engineering Draper Prize
1995
Box 13, folder 10
Miscellaneous VTR notes and early book draft pages
2007-2008
Box 13, folder 11
Speech, Eta Kappa Nu (Honor Society of IEEE, Institute of Electrical & Electronics Engineers)
1992 December
Box 13, folder 13
Names, Ampex-era
2006 November-December
Box 13, folder 14
Ampex/VTR 8x10 photos (photocopies) for SMPTE 2006 presentation
2006
Box 13, folder 15
List of documents, letters for book project
2006
Box 13, folder 16
Oral history interviews
2006-2007
Box 13, folder 17
Dolby Labs internal Oral History program
2003-2004
Box 13, folder 18
Scott Budman interview w/Ray Dolby for Ampex docu. and book about Dolby
2005-2006
Box 13, folder 19
TV Technology's James O'Neal interview w/Ray Dolby (and resulting article)
2006
Box 13, folder 20
Archive of American Television interview w/Ray Dolby
2006-2007
Box 13, folder 21
Topics of interest to R Dolby, science & technology (newsclippings)
1961-2000
Box 13, folder 22
Topics of interest to R. Dolby, audio & video recording industry (newsclippings)
1999-2004
Box 13, folder 23
Topics of interest to R. Dolby, film industry (newsclippings)
1988-1999
Box 13, folder 24
Topics of interest to R. Dolby, theater preservation in San Francisco
2005
Box 14, folder 1
Topics of interest to R. Dolby, obituaries (newsclippings)
1998-2010
Box 14, folder 2
Topics of interest to R. Dolby, management styles (newsclippings)
1995-2005
Box 14, folder 3
Topics of interest to R. Dolby, other companies (newsclippings)
2002-2006
Box 14, folder 4
Topics of interest to R. Dolby, locations/places of interest (newsclippings)
1979-2006
Box 14, folder 5
People of interest to R. Dolby (newsclippings)
1989-2007
Box 14, folder 6
On biographies - biography methods (newsclippings)
1998-2006
Box 14, folder 7
On biographies - producing a memoir
2004-2006
Box 14, folder 8
On biographies - R. Dolby, philosophy (newsclippings)
1999-2007
Box 14, folder 9
On biographies - R. Dolby notes for proposed book
1996-2010
Box 14, folder 10
On biographies - comic strips featuring Ray Dolby
1988-1995
Box 14, folder 11
Ray Dolby, 1933-2013: His life told for his granddaughters, by Dagmar Dolby (family biography)
2019
Box 14, folder 12
Stella and Hannah's Family Tree, assembled by Dagmar Dolby (family biography)
2015
Box 14, folder 13
Violet and Julia's Family Tree, assembled by Omi Dagmar Dolby (family biography)
2015
Box 14, folder 14
Ray Dolby: Engineer/Businessman/Pilot, ed. & rev. by Dagmar Dolby, written by Peter Cowie
2024
Series 2. Ampex/VTR, 1949-2007
Scope and Contents
This series includes Dolby's research files, notes, diagrams and designs pertaining to the development of the videotape recorder
(VTR) for Ampex Corporation, including suggestions Dolby made as a teenager, during his stint as an electronics instructor
for the US Army, and while he was in graduate school in the UK. This series also includes correspondence, photographs marking
multiple anniversaries of the VTR, published accounts of the VTR's impact, and published histories of its development.
Box 15, folder 1
VTR History from Charles P. Ginsburg's archive
1953-2006
Box 15, folder 2
Ampex staff badge, newsclipping re: Marshall Scholarship
1955-1957
Box 15, folder 3
Ampex Corporation profit-sharing handbooks
1958
Box 15, folder 4
Correspondence w/Ampex during Army deployment
1954
Box 15, folder 5
Ampex historical misc. inc. Poniatoff obit., C. Ginsburg memorial by R. Dolby, Ampex in the news
1976-1992
Box 15, folder 6
Correspondence, misc. (inc. Roizen/Gundy Kitchen Debate Russia, Ampex misc)
1985-2005
Box 15, folder 7
Ampex, Sight & Sound script (briefly featuring Ray Dolby)
1957
Box 15, folder 8
VTR Notebooks
1952-1953
Scope and Contents
Original pages from these notebooks appear later in this series, in this box and others, in folders of anniversary presentation
materials (for SMPTE, AES, etc.)
Box 15, folder 9
Ampex Log Book 1 (Project Name "TVR")
1955
Box 15, folder 10
Ampex Log Book 2 (Project Name "VTR")
1955
Box 15, folder 11
Ampex Log Book 3 (Project Name "VTR")
1957
Box 15, folder 12
Ampex/VTR Technical Papers, "The Video Processing Amplifier in the Ampex Videotape Recorder" (Stanford English 129)
1957
Scope and Contents
R. Dolby coursework for Stanford
Box 15, folder 13
Ampex/VTR Technical Papers, "An Economic Study of Videotape Replacement of Kinescope" (Stanford English 129)
1957
Scope and Contents
R. Dolby coursework for Stanford.
Box 15, folder 14
Ampex/VTR Technical Papers, "The Video Processing Amplifier in the Ampex Videotape Recorder" (text and pictures)
1957
Box 15, folder 15
Ampex/VTR Technical Papers, "Videotape vs. Kinetoscope"
1957
Box 15, folder 16
Ampex/VTR Technical Papers, WESCON 1957, "Comments on the History of Wideband Recording"
1957
Scope and Contents
WESCON = Western Electronic Show and Convention
Box 15, folder 17
Ampex/VTR Technical Papers, "Pilot Tone Color VTR System" (color recording), "Dropout Transient Reducer," and calculations
1955-1957
Box 15, folder 18
VTR Electronics Designs, Dolby's original drawings
1955-1956
Box 15, folder 19
VTR Electronics Designs, photocopies of Dolby's original drawings 1953-1956,
ca. 1996-2006
Box 15, folder 20
Correspondence, Joe Roizen, SMPTE
1975
Box 15, folder 21
Correspondence, Peter Rainger, Assistant Director of Engineering, BBC
1976
Box 16, folder 1
Ampex ephemera, "AMPEX Monitor" newsletter
1958-1962
Box 16, folder 2
Ampex ephemera, "AMPEX Playback" corporate publication
1956-1957
Box 16, folder 3
Ampex ephemera, Journal of the SMPTE, vol. 66, no. 4
1957 April
Scope and Contents
This journal issue features "The Ampex Video Tape Recorder - Modulation System - Rotary Head Switching," articles by Ampex
VTR team members Charles P. Ginsburg, Charles E. Anderson, and Ray M. Dolby.
Box 16, folder 4
Ampex ephemera, product information
ca. 1960-1990
Box 16, folder 5
Ampex ephemera, AMPEX VTR-1000 Videotape Recorder/Reproducer publication & specifications
1956-1957
Box 16, folder 6
Ampex ephemera, corporation Annual Report
1958
Box 16, folder 7
Ampex/VTR, 20th Anniversary of VTR at National Association of Broadcasters (NAB) - photos
1976
Scope and Contents
Photos by recording engineer George Schowerer. NAB was formerly NARTB - Nat'l Ass'n of Radio and Television Broadcasters.
Box 16, folder 8
VTR 30th Anniversary 1986, Ampex history, Charles P. Ginsburg retirement (Dolby's notes)
1986
Box 16, folder 9
VTR 30th Anniversary 1986, miscellaneous
1986-1999
Box 16, folder 10
VTR 30th Anniversary 1986, VTR Milestones in publications/clippings
1962-1981
Box 16, folder 11
VTR 30th Anniversary 1986, San Francisco SMPTE meeting/presentation invitation
1986
Box 16, folder 12
VTR 30th Anniversary 1986, SMPTE Archival/Historical Papers Session
1986-1998
Box 16, folder 13
VTR 30th Anniversary 1986, SMPTE paper pre-print, drafts, and outtakes
1986
Box 16, folder 14
1987 Ampex sale (misc. docs. related to sale of corp.)
1987-1996
Box 16, folder 15
1997 AES 50th Anniversary Program (Ray Dolby speaker re: Ampex)
1997
Box 16, folder 16
Ampex/VTR AES (Audio Engineering Society) 50th Anniv., Dolby presentation notes
1997
Box 16, folder 17-18
Ampex/VTR Audio Engineering Society (AES) 50th Anniversary presentation photos
1997 September
Scope and Contents
These folders contain photos dating to the early 1950s at Ampex. They have been copied, shared, and used several times for
various presentations and publications, hence they are not in chronological order of the date the photos were taken, but in
original order reflecting how these photos were used.
Box 17, folder 1
2006 VTR Research Project, Dolby notes and SMPTE 2006 badge
2006
Box 17, folder 2
2006 VTR Research Project, miscellaneous VTR-related correspondence, clippings
1995-2006
Box 17, folder 3
2006 VTR Research Paper, historical documents (newsclippings, Ampex press releases, etc.)
1954-1994
Box 17, folder 4
2006 VTR Research Project, published article-length histories of broadcast videorecording
1981-2002
Box 17, folder 5
2006 VTR Research Project, VTR articles
1974-1994
Box 17, folder 6
Patents research conducted 2006 (into patents filed by A. Maxey, C. Anderson, F. Pfost)
2006
Box 17, folder 7
Patents research conducted 2006, copies of pages from patent dated 1959
2006
Box 17, folder 8
Patents research conducted 2006, VTR photocopies
n.d
Box 17, folder 9
Patents research conducted 2006, VTR patents (originals)
1955-1961
Box 17, folder 10-11
Patents research conducted 2006, R. Dolby 1958 essay re: VTR development
2006-2007
Box 17, folder 12
Other papers on VTR, Albert Abramson, "The Evolution of Videotape Recording"
1991
Box 17, folder 13
Other papers on VTR, Charles P. Ginsburg, "Development of the Videotape Recorder"
1986 October
Box 17, folder 14
Other papers on VTR, Charles P. Ginsburg, "The Birth of Videotape Recording" (1957 SMPTE paper)
1999
Box 17, folder 15
Other papers on VTR, William Lafferty, "Introduction of Videotape Recording to American Broadcasting"
1987
Box 17, folder 16
Other papers on VTR, VTR related correspondence (P. Hammar, R. Warner)
1990-1996
Box 17, folder 17
Other papers on VTR, from Ray Dolby's VTR files
1956-1976
Scope and Contents
Folder includes an A. Maxey patent from 1964.
Box 18, folder 1
VTR misc., photocopies of Ampex photos and R. Dolby's original rotary head design
1953-2006
Box 18, folder 2
VTR misc., SMPTE 30th VTR Anniversary preprint and photocopies of Ampex notes
1986
Box 18, folder 3
Ampex/VTR Photo/slide orders for R. Dolby's AES and SMPTE Technical Conference presentation
2006
Scope and Contents
Many of the photos in this folder are Ray Dolby's originals from the 1950s at Ampex.
Box 18, folder 4
Ampex/VTR AES Oct 2006 San Francisco, R. Dolby VTR presentation photos
2006
Box 18, folder 5-6
Ampex/VTR Slides and photos for R. Dolby's presentation at Oct 2006 SMPTE
2006
Scope and Contents
These folders include slides organized in the 1980s by Donna Foster Roizen (aka Foster Beigler), photographer and wife of
Joe Roizen. Some photos in this folder include copies of original snapshots taken by Ray Dolby at Ampex in the 1950s.
Box 18, folder 7
Ampex/VTR Receipts for photo prints, slides, and slide projector rental
2006
Box 18, folder 8
Ampex/VTR VTR photos not used for R. Dolby Oct 2006 SMPTE presentation
2006
Box 18, folder 9
Ampex/VTR R. Dolby's photos of A. Maxey's helical development 1956, "not using" for 2006 SMPTE
2006
Scope and Contents
Folder contains Ray Dolby's original snapshots from the 1950s of Alex Maxey's work at Ampex.
Box 18, folder 10
Ampex/VTR VTR lab 1956, photos of Harold Walsh and Charles Ginsburg
1956
Box 18, folder 11
Ampex/VTR Photos from R. Dolby's 1956 slides, printed for 2006 SMPTE
2006
Box 18, folder 12
Ampex/VTR R. Dolby's Ampex/VTR slides
1956
Box 18, folder 13
Ampex/VTR Original photos of Ampex 1956 and NAB 1956 not using" for Oct 2006 SMPTE
2006
Scope and Contents
Folder contains Ray Dolby's original snapshots of people working at Ampex in the 1950s.
Box 18, folder 14
Ampex/VTR Assorted photos from Nat'l Assn. of Broadcasters convention 1956
1956
Scope and Contents
The National Association of Broadcasters was originally--and in 1956--known as the National Association of Radio and Television
Broadcasters, or NARTB.
Box 18, folder 15
Ampex/VTR Old Timer's Picnic
ca. 2000-2011
Box 18, folder 16
Patent Applications, Processing Amplifier
1957
Box 18, folder 17
Patent Applications, Correspondence, Paul Flehr
1958
Box 18, folder 18
Patent Applications, Non-R. Dolby VTR-related patents
1957-2006
Box 18, folder 19
Patent Applications, Dropout Reducer Patent Application
1958-1959
Series 3. Academic Research, Cambridge University, 1957-1965
Scope and Contents
This series includes research files, notes, correspondence, reprints of articles Ray Dolby used for research and reprints
of articles he authored or co-authored while conducting postgraduate research in physics at Cambridge University's Cavendish
Laboratory. Of note are Dolby's planning documents and working drafts for his doctoral thesis on long wavelength X-ray microscopy.
Also of note are Dolby's collection of work by "other inventors," correspondence with Ampex Corporation's patent attorney
Paul Flehr, and files from Dolby's period as a consultant for the UK Atomic Energy Authority.
Box 19, folder 1
"Some Methods for Analysing Unresolved Proportional Counter Curves of X-ray Line Spectra," R. M. Dolby (reprint)
1958
Box 19, folder 2
"A Spectrometer System for Wavelength Emission Microanalysis," R. M. Dolby & V. E. Coslett
1959
Box 19, folder 3
"Absolute intensity measurements of the carbon and aluminium X-ray K-lines with a proportional counter," R. M. Dolby
1959-1960
Box 19, folder 4
Circuit Design Drawings
1960
Box 19, folder 5
Gun biasing paper, drafts, pre-print materials, published copy
1960
Box 19, folder 6
"The Bias Network and Electron Gun Current Stability," R. M. Dolby & D. W. Swift
1960
Box 19, folder 8
"Stabilization of Rotating Bodies in Systems Subject to Angular Acceleration with Special Regard to Motor Recording Equipment"
and corres. with Paul Flehr
1962
Box 19, folder 9
Problems for EDSAC computer (Electronic Delay Storage Automatic Calculator)
1962-1963
Box 19, folder 10-11
EDSAC files: diagrams, photos, graphs (Electronic Delay Storage Automatic Calculator)
1962-1963
Box 19, folder 12
EDSAC files: negatives of diagrams, photos, graphs, inc. negs. of blanking and seaming coils
1962-1963
Scope and Contents
One of the negatives shows use of the Kodalith process.
Box 20, folder 1
Thesis & Paper Planning (working documents, class notes, research correspondence)
1957-1963
Box 20, folder 2
Thesis Chapter 2 (Counter)
1961-1963
Box 20, folder 3
Thesis, Derivations and Worksheets
1961-1963
Box 20, folder 4
Thesis, Chapter 6 (Deconvolution by the Fourier Transformation)
1961-1962
Box 20, folder 5
Thesis for D. Phil., Cambridge, "Long Wavelength X-ray Microanalysis"
1961
Box 20, folder 6
Encyclopedia paper, "K-line quantum yields from the light elements"
1963
Scope and Contents
Published in The Encyclopedia of X-rays and gamma rays, 1963
Box 20, folder 8
Network Theory, New Network Unit, AWRE Electronics (Atomic Weapons Research Establishment)
1962
Box 20, folder 9
Network Theory, Network Errors
1962-1963
Box 21, folder 1
International reprints on the mathematics of sound
1954-1957
Box 21, folder 2-4
International reprints on X-ray microanalysis requested by or sent to R. Dolby
1951-1965
Box 21, folder 5
International reprints in X-ray microanalysis that cite R. M. Dolby
1959-1965
Box 21, folder 6
Materials from Nuclear Diodes, Inc. (supplier of electron beam instruments)
1970
Box 21, folder 7
"Pulse-Analysis Method of Light Elements," G. Shinoda et al, Osaka Univ
1965
Box 21, folder 8
Electron Microprobe Analyzer (Materials Analysis Co., Palo Alto, CA)
1963
Box 21, folder 9
Electron Microprobe Analyzers (various manufacturers)
ca. 1963
Box 21, folder 10
Cambridge Electron Microscope and Microscan X-ray Analyzer
1963
Box 22, folder 1
"Some Theoretical Aspects of Pulse Analysis," R. M. Dolby
1962-1963
Box 22, folder 2
"An X-ray Microanalyzer for Elements of Low Atomic Number," R. M. Dolby
1963
Box 22, folder 3
Lectures on Electron Microscopy, etc., Central Electrochemical Research Institute, Karaikudi, India
1964
Box 22, folder 4
Stanford Conference Paper for 3rd International Symposium on X-ray Optics and X-ray Microanalysis
1962
Box 22, folder 5
A.W.R.E. (Atomic Weapons Research Establishment), graphs and readings re: UKAEA project (United Kingdom Atomic Energy Authority)
1963
Box 22, folder 6
"X-ray Microanalysis of the Light Elements" (prospectus, drafts, revisions)
1960-1963
Box 22, folder 7
"X-ray Analysis of the Light Elements" (submission draft with pre-publication materials, photos)
Box 22, folder 8
Photos, diagrams, graphs for "X-ray Microanalysis of the Light Elements" for publications and various presentations
Box 23, folder 1
International Conference on X-Ray Microanalysis, Paris
1965
Box 23, folder 2
Institute of Physics and the Physical Society, Conference on Electron Probe Microanalysis, London
1967
Box 23, folder 3
Electron microprobe publication reprints, metal finishing
1963-1965
Box 23, folder 4
Electron microprobe publication reprint, "An Electron Current Amplifier"
1965
Box 23, folder 5
Electron microprobe analysis, conference publications and reprints
1968-1973
Box 23, folder 6
Other inventors, H. Clayton Gerard, "Circuit Board Drawing of Electronic Vendor" and "Electronic Automated Calculating Machine"
1953
Scope and Contents
Oversized materials that illustrate the machines described in these documents are located in map-folder 30.
Box 23, folder 7
Other inventors, Reginald Williamson, "An Experimental Condenser Microphone"
ca. 1957
Box 23, folder 8
Other inventors, Yoshiyo Wada, "Apparatus for guiding and driving a tape for magnetic recording"
1959
Box 23, folder 9
Coslett, V. E. (Vernon Ellis) publication reprints
1958-1964
Box 23, folder 10
"Bibliography on Electron Probe Microanalysis and Related Topics"
1962
Box 23, folder 11
"Bibliography on Electron Probe Microanalysis and Related Topics" (second revision)
1963
Series 4. Dolby Laboratories, 1963-2010
Scope and Contents
This series contains material related to the founding and growth of Dolby Laboratories. It includes personal and business
correspondence, reports, research publications, trade publications, public relations matter and press kits, instructions in
English and German for the A301 Audio Noise Reduction System, internal memos, an employee handbook, examples of and a history
of the company logo, an internally produced history of the company, and materials regarding licensing and trademark. Of note
are extensive memos and test results regarding the development of Dolby SR (Spectral Recording) and a production binder for
the Dolby SR Cat. 280A and 280B motherboards. The series also includes an encapsulated sample of Dolby logo leader for open
reel audiotape.
Box 24, folder 1
Correspondence, Hans Deltrap
1964 April 14
Box 24, folder 2
Correspondence, Dale Dolby
1965-1968
Box 24, folder 3
Dolby Laboratories facilities search, London
1965 June
Box 24, folder 4
Conference program, "Starting One's Own Business" (November 1970) and miscellaneous
1965-1972
Box 24, folder 5
Dolby Labs A301 Noise Reduction System
1966-1970
Box 24, folder 6
Südwestfunk report on A301 (German radio broadcast)
1970
Box 24, folder 7
KLH Model 40 press releases
1968
Box 24, folder 8
Dolby B-Type consumer units, lists, photos (Nakamichi Research)
ca. 1970-1975
Box 24, folder 9
First experimental FM broadcasts using Dolby B-Type encoder unit, WFMT Chicago
1971 June
Box 24, folder 10
Dolby B-Type System, David Robinson paper, "Application of Dolby B-Type Noise Reduction to FM Broadcasting"
1971
Box 24, folder 11
Dolby Labs B-Type noise reduction system, units literature and reviews
1970-1971
Box 24, folder 12
Dolby Labs B-Type System publicity and reviews
1970
Box 24, folder 13
Dolby B-Type consumer units literature and reviews
1970
Box 24, folder 14
Dolby Laboratories Literature Kit
1970
Box 24, folder 15
Dolby 324 B-Type Broadcast Encoder specs
ca. 1971
Box 24, folder 16
"Dolby B-Type Noise Reduction System," R. Berkovitz and K. Gundry
1973
Box 25, folder 1
Dolby Labs German reports, translated literature, license agreement, press
1969
Box 25, folder 2
Dolby Labs press releases and press kits, A301
1969-1970
Box 25, folder 3
Dolby Labs press releases
1970-1974
Box 25, folder 4
Dolby Labs Distributor Training and Publicity Kits
1969-1972
Box 25, folder 5
Dolby Labs Licensing Bulletin
1972
Box 25, folder 6
Miscellaneous trade shows and exhibitions
1972-1973
Box 25, folder 7
Advertising featuring Jac Holzman, Electra Records, and miscellaneous
1970
Box 25, folder 8
Dolby distributors list and miscellaneous
1969
Box 25, folder 9
Hi-fi shops list (United Kingdom)
1969-1970
Box 25, folder 10
Dolby Labs advertising and marketing, English and German
1972-1973
Box 25, folder 11
Dolby Labs advertising and publications
1969-1970
Box 25, folder 12
Dolby Labs user lists
1969-1974
Box 25, folder 13
Dolby Laboratories price lists and ordering information
1969-1971
Box 26, folder 1-2
Sales literature, Dolby Labs Professional Products binder contents
ca. 1972
Box 26, folder 3
Sales literature, Dolby Labs Professional Products vinyl binder
ca. 1972
Box 26, folder 4
List of recordings made with Dolby technology
1968-1970
Box 26, folder 5
Dolby Labs Public Relations (Dagmar Dolby)
1969-1970
Box 26, folder 6
Internal correspondence regarding documentation of Dolby Labs correspondence (Dagmar Dolby and examples)
1969
Box 26, folder 7
"Dolby Digest" internal newsletter, edited by Dagmar Dolby
1972-1975
Box 26, folder 8
Memos, "London distortion problem," etc.
1986-1988
Box 26, folder 9
Memos re: Fairlight spikes
1988
Box 26, folder 10
Memos, spike guard circuit (includes copies of circuit drawings)
1988-1989
Box 26, folder 11
Memos, LF O/S standardization
1988
Box 26, folder 12
Memos, LF FB and SB O/S standardization
1988
Box 26, folder 13
Memos, HF O/S AOT data collection
1985-1988
Box 26, folder 14
Memos, O/S 1 (BBC VTR/SR Multigeneration Stereo Tests)
1987-1988
Box 26, folder 15
Memos, Cat. No. 431 spectral recording module tests
1988-1989
Box 26, folder 16
Memos, MLS/LF/FB modulation distortion
1990
Box 27, folder 1
Dolby Labs history, chronology
1965-1996
Box 27, folder 2
Dolby Archive, Dolby Museum at 100 Potrero Hill
2000-2001
Box 27, folder 3
Dolby Labs, miscellaneous copies/reports/newsclippings for R. Dolby (internal)
1995-2003
Box 27, folder 4
Dolby Labs, various articles (re: digital sound technology and branding)
1975-2000
Box 27, folder 5
Dolby Labs, various internal memos and correspondence
1987-2005
Box 27, folder 6
Dolby Labs, origin of the logo and examples
1969-2005
Box 27, folder 7
Dolby Labs, Ray M. Dolby-authored reprints
1968-1983
Box 27, folder 8
Dolby Labs, Dolby Noise Reduction selected bibliographies
1979-1980
Box 27, folder 9
Dolby Labs, employee handbook
1988
Box 27, folder 10
Dolby Labs, Spectral Recording SR Test Procedures, Cat. 280 A/B
1985-1986
Box 27, folder 11
Dolby Labs, contents of production binder for Cat. 280B (schematics and component grid location sheets)
1986
Material Specific Details: Multiple sheets printed with thermal ink interleaved with silicon release paper to prevent sticking.
Box 27, folder 12
Dolby Labs, Cat. 280B assembly information, drawing
1987
Box 27, folder 13
Dolby Labs, Cat. 280A Dolby notes, assembly information (parts list), drawing
1987
Box 28, folder 1
Dolby Labs, Licensing Handbook inc. trademark and noise reduction reports(A, B, C, and S types; Yamaha ProLogic)
1998-1999
Box 28, folder 2
Dolby Labs, correspondence re: use of Dolby logo by Broadcast Archives and
2004
Box 28, folder 3-4
Dolby Labs, consumer audio magazines
1986-1997
Box 28, folder 5
Dolby Labs, consumer electronics literature w/Dolby technology
1986-1996
Box 28, folder 6
Dolby Labs, Sony SDDS literature
1997
Box 28, folder 7
Dolby Labs, Dolby logo open reel audio splicing tape sample
n.d.
Series 5. Circuit Drawings, Schematic Diagrams, and Artifacts, 1949-1988
Scope and Contents
This series is comprised predominantly of circuit drawings and schematics from Ray Dolby's work with Ampex on the videotape
recorder project and a selection of drawings, notes, and schematics from Dolby Laboratories regarding two key technologies:
the A301 Audio Noise Reduction System and Spectral Recording. The earliest drawings from Dolby Labs include schematics for
a video noise reduction system prototype and schematic diagrams of the circuitry used in the A301. Other materials include
a selection of Dolby's high school drafting assignments, a selection of pre-publication materials on drafting vellum and frosted
mylar from Dolby's X-ray analysis research at Cambridge University, and a certificate proclaiming Dolby's election as a corporate
member of the British Kinematograph, Sound, and Television Society.
Box 29, folder 1
High School drafting class drawings
1949
Box 29, folder 2-6
Network Theory pre-publication graphs and diagrams on frosted mylar and drafting vellum
1961-1962
General
Materials in these folders correspond to Network Theory research files in Box 20 ff 7-9.
Box 29, folder 7
Membership certificate, British Kinematograph, Sound, and Television Society
1967
map-folder 30
Circuit Board Drawings of Electronic Vendor and Electronic Automated Calculating Machine, created by H. Clayton Gerard
1953
General
Oversized materials removed from Box 23 ff 6: Other inventors, H. Clayton Gerard, "Circuit Board Drawing of Electronic Vendor"
and "Electronic Automated Calculating Machine" 1953.
map-folder 31
Circuit Drawing, VTR Processing Amplifier, Ray Dolby
1956
General
Circuit drawing by Ray Dolby of Ampex VTR component (processing amplifier) patented by Dolby.
map-folder 32
VTR Schematics, Switcher, Blanking Switcher, Regulated Power Supply, Left Hand Control Panel, and Capstan Servo
1957 September
map-folder 33
VTR Schematics, Remote Control, Left/Right Meter Panels, Relay Power Supply, Top Plate Transport
1957 September
map-folder 34
VTR Schematics, Record Amplifier Driver and Auto Compensation Sensor
1957
map-folder 35
VTR Schematics, Dropout Transient Reducer and Modulator/Demodulator, "Not For Manufacturing Purposes"
1957 September
General
Container includes two copies of the Dropout Transient Reducer design, signed by Ray Dolby.
map-folder 36
VTR Schematics, Motor Drive Amplifier and Record Amplifier Playback Preamplifier, artifacts
1957 September
map-folder 37
VTR design drawings, Right Hand Control, Master Control, and Remote Tape Transport Control Panel
1957
Box 38, folder 1
Video Noise Reduction Prototype V101 schematics, Front Panel, Rear Panel, Chassis
1965 July
Box 38, folder 2
Video Noise Reduction Prototype V101 schematics, Record Unit, Playback Unit, Signal Connections, Power Supply
1965 July-August
Box 38, folder 3
Video Noise Reduction Prototype V201 schematics, Front Panel, Chassis
Box 38, folder 4
Video Noise Reduction System schematics, V201 and V202
1965 September
Box 39, folder 1
Dolby noise reduction system, drawings 1-7
1965
Scope and Contents
File copies of Ray Dolby's original drawings for a noise reduction system, first intended for video noise reduction. Drawings
1-2, Record Unit and Limiter, are difficult to decipher because of poor diazoprint process.
Box 39, folder 2
A301 Audio Record Unit and Pulse Amplifier
1965
Box 39, folder 3
A301 Bar-Module Fastener, Transformer Shield Can, Front Panel
Box 39, folder 4
A301 Record Amplifier and Play Back Amplifier (three drawings)
1965
Box 39, folder 5
Filter Circuits for Channels 1, 2, 3, 4 (two drawings)
1965 October
Box 39, folder 6
A301 Filter Networks
1965 October
Box 40, folder 1
Compressor/Limiter circuit, 60 c/s Low Pass Limiter Channel 1
1965 October
Box 40, folder 2
Compressor/Limiter circuit, 60 c/s to 5k c/s Limiter Channel 2
1965 November
Box 40, folder 3
Compressor/Limiter circuit, 5k c/s High Pass Limiter Channel 3
1965 November
Box 40, folder 4
Compressor/Limiter circuit, 10k c/s High Pass Limiter Channel 4
1965 November
Box 40, folder 5
A301 Compressor Module
1965 December
Box 40, folder 6
A301 Control Module and Amplifier Module, drawings 34 & 35
1965 December
Box 40, folder 7
A301 Amplifier Module and Control Module, drawings 37 & 39
1966 January
Box 41, folder 1
Layout for A301 Power Supply Module (two drawings)
1966 February
Box 41, folder 2
A301 Power Supply Module Side Plate and Frame
1966 February
Box 41, folder 3
A301 Power Supply Module Front Panel and Chassis
1966 March
Box 41, folder 4
A301 Module Covers and Power Supply Module Spacer-Insulator (five drawings)
1966 March
Box 41, folder 5
A301 Rear Panel, Top/Bottom Cover, and End Plate (three drawings)
1966 March
Box 42, folder 1
A301 Chassis Connector (viewed from rear), 2 versions
1966 February - April
Box 42, folder 2
Power Supply Module A301
1966 March
Box 42, folder 3
A301 Block Diagram Processor A
1966 March
Box 42, folder 4
Block Diagram, A301 Audio Noise Reduction System
1966 March
Box 42, folder 5
Block Diagram, Use of Noise Reduction System in Audio Chain
1966 March
Box 42, folder 6
Chassis Layout A301
1966 April
Box 42, folder 7
Module Tester A301
1966 April
Box 42, folder 8
Component Board Layout, A301 Amplifier Module, Control Module, and Compressor Module
1966 April
Box 42, folder 9
Assembly Drawing of the Component Layouts for Control, Compressor, and Amplifier Modules
1966 May
Box 42, folder 10
Silkscreen Drawing of Cover Panels for Control, Compressor, and Amplifier Modules
1966 May
Box 42, folder 11
Lettering Layout for Chassis, Frame, Front Panel and Front Panel Trademark Layout
1966 May
Box 43, folder 1
Dolby Spectral Recording Lab Circuits, Tester Drawings, and Block Diagrams (14 drawings)
1982-1985
Box 43, folder 2
Spectral Recording Circuit Board Design, Cat. 280A
1985
General
This circuit board design was used for Ray Dolby's memorial card in 2013.
Box 43, folder 3
Spectral Recording Cat. No. 431 Partitioning Diagram
1986
Box 43, folder 4
Spectral Recording Circuit Board Designs for Cat. 280A/Cat. 280B and Block Diagrams (5 drawings)
1985-1988
Material Specific Details: Four of the five drawings are on drafting vellum.
Box 43, folder 5
Spectral Recording Circuitry, Cat. 280 (7 drawings)
1987-1988
Box 43, folder 6
Spectral Recording Circuitry, Cat. 300A and Cat. 300B (4 drawings)
1987
Box 43, folder 7
Spectral Recording Circuitry, Cat. No. 431 (4 drawings)
1987
map-folder 44
Dolby Spectral Recording, Cat. 280 wiring diagrams for troubleshooting (4 drawings)
1986
map-folder 45
Dolby Spectral Recording, Cat. 280B circuit drawings (4 drawings)
1987
map-folder 46
Dolby Spectral Recording, Cat. 280A and Cat. 280B circut drawings (4 drawings)
1987
map-folder 47
Dolby Spectral Recording, Cat. 280 tester diagrams and Cat. 230/331/431 universal tester diagrams (6 drawings)
1987
