Inside the covers of this one book are six different catalogs and manuals from the 1930s: Sound Amplifier Manual, Transmitter Guide, Serviceman's Guide, Radio Servicing Guide, Complete Transformer Catalog, and the "Tru-Fidelity" transformer guide.
There is wall-to-wall info, schematics, parts lists, performance specs, etc on big push-pull audio amplifiers, modulators, microphone preamps, power supplies, and almost any type of electronic gear that used transformers and chokes... obviously... Thordardson was in the iron business: power transformers, filter chokes, audio interstage and output transformers, and even kits.
The manuals show how to repair radios, build a condenser capacity and leakage tester, and measure and test unknown chokes and so much more. The transformer catalog is a gem if you frequent fleamarkets. Many of the items listed can be had for a dollar or two, and even free. You can cross check the numbers on the name plate to find the specs and then build that huge audio amp based on 845 or 800 triodes.
Price: $9.25
|
