Keppinger Theremin Part Deux

I think my tubes are OK after all - one of them is a real RCA tube - so I want to keep that one :)

So after even more tinkering I've got a great tone and response from the Theremin - although the tone itself does contain a trace of high end "sparkle" that I can't decide if I should keep (as it's in character) or filter it out.

Additionally, when I turn the volume knob I get a hint of "am radio tuning sound effect" in the background - is this normal as well?

Steve

If you here little whistles and whines that should not be there, likely you have a bit of tweaking to do. Ask Uncle Howie on Levnet about his experiences.

Check your oscillator freeks and make sure the mixing products of the harmonics are not less than 20 KHz.

Philip

Thanks - I tried signing up for Levnet, but never got a response - I'll try again.

I don't recall seeing a levnet sign-up from you in the recent past, and there aren't any outstanding requests, so please do try again.