Document Scans

By Jesse Acorn

On this page, I will link all of the documents that I have scanned (and in some cases, that others have scanned for me), including books, manuals, and schematics. All were unavailable online from any other source at the time of scanning, as far as I could find. I have especially focused on providing info about early (especially tube-based) electronic musical instruments, which is quite scarce online as of this writing. If you find these documents useful, please consider thanking me, or even donating a small amount to my PayPal (both via the email listed on my contact page), but there is no obligation to do so.


  • Electronic Musical Instruments by S.K. Lewer (1948) — A British title featuring detailed descriptions of early electronic instruments, including the Trautonium, Theremin, Hammond Novachord, Compton Electrone, Everett Orgatron (electrostatic reed organ) and Pianotron (electrostatic piano), Maurice K. Bretzfelder's "Electone" (electrostatic piano), and more, though the focus is more on general principles than on specific instruments. Various design ideas are discussed that may never have seen commerical application. It even describes a multi-head tape echo using steel tape, like the Blatterphone and Marconi-Stille recorders!
  • Electronic Musical Instruments, 3rd Edition by Richard H. Dorf (1968) — Third and final edition of this great American treatise, almost entirely different from preceding editions. The first seven chapters comprise perhaps the best "primer" on electronic organs ever written. Descriptions and schematics are given for many commercial instruments of the 1960s, including the Baldwin Orga-sonic 54A, Conn Classic 825, Gulbransen Rialto K, Hammond D-100, Lowrey Theatre Spinet H, Rodgers 32-B, Schober Theatre, Seeburg Carlyle Deluxe, Thomas Celebrity 800, and Wurlitzer 4140. These are mostly discrete transistor designs, with tubes used in some models, and extremely few integrated circuits.
  • Electronic Organ Handbook by H. Emerson Anderson (1960) — A detailed text featuring descriptions, schematics, and service tips for various 1950s American organs. These include the Baldwin 45H, 45C, and 45H2; Conn Rhapsody 600, 610, and 620; Gulbransen B, C, G, and B-2 ; Hammond M-3 and S-6; Kinsman A, B, C, and CP; Lowrey S, SS, and DS; Thomas G, GP, GS-1, H, J, and K; and Wurlitzer 4000. All except the Gulbransens are tube-based instruments. Leslie speakers — models 47 and 51C — are also covered, as well as the Conn Strobotuner.
  • Simple Electronic Musical Instruments for the Constructor by Alan Douglas (1955) — Another British book, which describes various musical circuits in enough detail to build them. These include an "infinitely variable" tone generator (using a thyratron relaxation oscillator), a 5-octave monophonic keyboard (using a resistance-tuned "pulse generator" oscillator), a thyratron-based frequency-divider chain operable over several octaves, an "electronic accordion" that is basically a copy of the Hammond Chord Organ's chord division, various volume-envelope & control circuits, and it even mentions the "well-known Eccles-Jordan circuit" (Lowrey fans will know the significance of this being said in 1955!) Also described are a standalone pedal bass instrument, and an early electric guitar.

Schematics & Service Manuals

For some of these documents, I have higher-quality scans available upon request. However, even without the higher-quality versions, you will find that all scans are quite clear and readable. Some processing could improve the contrast, and OCR processing could give easily searchable and copiable text. As well, for those documents that I did not make into a PDF (due to variations in page size), a PDF could be made; I will probably figure this out at some point.

If you notice any errors or have additional information that you would like to add, please contact me!

First Published: 12/30/2019