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TonyDuell · 26th Feb 2020, 11:22 am

I found the service manual for the RCA Theremin on some site or other. I am not sure if its the same circuit, but the volume control RF oscillator powers the filament of one of the valves directly, controlling the fillament current controls the volume.

If you think it would be useful, and can't find it, PM me with your e-mail address and I'll send it to you.

26th Feb 2020, 11:22 am	#12
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,215	Re: Professor Theremin advert. I found the service manual for the RCA Theremin on some site or other. I am not sure if its the same circuit, but the volume control RF oscillator powers the filament of one of the valves directly, controlling the fillament current controls the volume. If you think it would be useful, and can't find it, PM me with your e-mail address and I'll send it to you.