An introduction to George A Philbrick pdf format
A tribute to George A Philbrick by Hank Paynter pdf format
Applications Manual for Computing Amplifiers for Modeling, Measuring, Manipulating & Much Else
Email exchange with Winfield Hill and Guy Macomb in the sci.electronics.design newsgroup. I have since moved all the Philbrick material mentioned in this discussion from WWW.Photodex.com to this site. This link died any help would be appreciated in finding where it moved. k2w_at_PhilbrickArchive_dot_org.
There is a fair amount of reference to Philbrick in the newsgroup sci.electronics.design. A search for Philbrick or Lightning Empiricist will turn up several results.
Dr. Kent Lundberg at MIT, knows a lot about analog computer history. Just recently, he edited an excellent series of articles about the History of Analog computers in the June 2005 issue of IEEE Control Systems Magazine. This magazine is available online to members of the Control Systems Society of the IEEE. Non-members pay a steep fee for access to the articles. You may do better to find this magazine in a technical college library. Among other writings, Dr. Lundberg has written a paper on Miller feedback in opamps.
Comdyna was founded by Ray Spiess and has been manufacturing the Comdyna GP-6 Analog Computer since 1968, for use as an academic teaching tool for control system fundamentals. The Comdyna GP-10s Analog Computer is a newer product aimed at music synthesis.
Walt Jung has published an excellent OPAMP applications handbook on the Analog Devices web site. The whole 970 page book is downloadable in whole or in separate chapters. Chapter H makes an extensive presentation of the history of the OPAMP and several references are made to Philbrick. The very long list of bibliogrphic references in the history chapter points to many patents and papers showing circuit topologies contemporary with GAP/R.
Peter Millet has published an enourmous amount of information relating to vacuum tubes in his web site. He has extensive coverage of tube data sheets and several copyright-free scanned classic books on Vacuum tubes. 1.2GB of information in all!
www.otto-schmitt.org Otto Schmitt was an early amplifier inventor and developer, with work preceeding Philbrick. He is most famous for the Shmitt trigger. The following two links point to papers by Otto Schmitt.
(Achim Dassow, thanks for pointing out this information)
Bernd Ulmann has a very interesting page showing Analog computing at Telefunken in Germany, using vacuum tubes.
Ed Thelen has a very interesting page dedicated the the Nike missile. The operation of the Nike was controlled by analog computation.
The computer museum at Mountainview CA puts the K2-W opamp in context with the major lines of analog circuit development at this link:
A further reference to Philbrick, the company, is at
Frequent Phibrick Archive contributor, Achim Dassow discovered this link to a paper about opamp design with subminiature tubes at MIT in 1947.
SOME DESIGNS AND APPLICATIONS FOR PACKAGED AMPLIFIERS USING SUBMINIATURE TUBES
B. CHANCE, J. N. THURSTON, P. L. RICHMAN
TECHNICAL REPORT NO. 20
RESEARCH LABORATORY OF ELECTRONICS
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Mike D'Alessio has built one of the best archival pages on the web to show all Radio Shack Catalogs: www.radioshackcatalogs.com. Radio Shack was a mature electronics retail and distribution business in Boston, by the time that GAP/R started in 1948. It is very likely that Philbrick bought some of it's electronic gear at Radio Shack.
Emilio Ciardiello has posted interesting articles at www.RadioMuseum.org about analog and digital computing in the 1950's:
These articles also include contributions by Ernst Erb and Roy Johnson.
SR-209 HF/VHF/UHF/SHF surveillance receiver was used by the CIA and employed a PP65AU opamp what was second-sourced or resold by Zeltex of Concord CA. (Contributed by Paul Reuvers 3-6-2019)
Achim Dassow has written an interesting retrospective on early vacuum tube techniques for high impedance current sources. The article is written in German, but can be read in other languages with an on-line translator Current sources and current sinks with vacuum tubes (added 11-10-2019) Thank you Achim, for such an interesting article.