Solovox, 1940

[PRR]

[Rob Strand]

Hard to believe but the internet wins,

[amptramp]

Reality is even better.  I have a Solovox Model L (the latest version from 1948) that I got at a flea market.  It was missing the speaker and all the transformers but since I couldn't find the driver transformer for the output stage, I used a twin triode in place of the single triode and made a phase splitter stage, which is probably better anyway.

There is a full restoration story here with schematics and the differences explained between the Model L and the earlier models, which were largely different:

https://antiqueradio.org/HammondSolovoxKeyboard.htm

One part of the circuit that is interesting is the use of remote-cutoff pentodes for gain control as drivers for the push-pull output tubes.

[duck_arse]

"... attached by thumbscrews ....."

grand piano owners love attaching things to their instrument with thumbscrews, I'm sure.