Archive of the former Yahoo!Groups mailing list: tube synth diy

Looking at some divide by two circuits:

I haven't had much luck prototyping the Pentode van der Pol type circuit nor the single tube pentode trigger circuits - yet. I think the key may be to use a negative supply to bias the suppressor (which I haven't done yet, and isn't always theoretically necessary).

Anyhow I'll scan in some examples. Anybody gotten a good trigger or relaxation oscillator with the van der Pol model? It looks like this was the method of creating sub-octaves on the Hammond Novachord.

Regards,

Lorin E. Parker