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

Hi Lorin
uploaded a chapter from Puckle's Time Bases, which discusses van der Pol's cct and introduces a number of ccts developed from it.
Hope it helps!
http://launch.groups.yahoo.com/group/tubesynthdiy/files/Puckle/


--- In tubesynthdiy@yahoogroups.com, "Lorin Edwin Parker" <parker@...> wrote:

>
> 
> 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
>