"Volcano Overdrive" please check this for me ?

[MartyMart]

http://aronnelson.com/gallery/Martys-layouts-and-photos/Volcano_OD

This has three stages of Joe Davissons "Blackfire" followed by a boost stage with
Ge diodes to ground and a final volume boost stage before the output.
The gain pot has a feedback path, ( ?? )  returning at the final stage also.
Sound is rich and Fat, thinning slightly at higher gains.
Seems to be working well, but please check and tell me if I have
something "wierd" going on here !!  ?

Marty.

[WGTP]

Looks cool.

It's similiar to a Joe Davidson variation on my breadboard that is a Jfet Vulcan stage, a std. Vulcan stage and 2 LED's to ground.  It has the Vulcan squish with a little more edge.  Pretty Ampish IMHO.   

[vanhansen]

Hmmm, looks interesting.  I like Joe's stuff.  Very simple yet KILLER sound.  I may have to try this out after I get through playing with op-amps.

[MartyMart]

The connection from middle of gain pot back to the output transistor bothers me !
Without it, it's a kind of "Thin/high Gain" tone but very quiet.
I can't find a mistake, but that "loop" came about by probing with a section of
wire, that "path" brought back all the "guts" and volume .... !!
Perhaps someone will chime in and tell me what's wrong here ?

Ta,
Marty.

[MartyMart]

BUMP !
Anyone have any ideas/comments  ?? 

M.

[Joe]

The first set of 390k/100k bias resistors can be eliminated.

[Dirk_Hendrik]

I would add a cap  between the gain wiper and that 10k resistor to make the bias of the last trannie completely independent of the gain control.

Not necessary but personally I prefer an output buffer or at least an output cap. No need to rely on the fact that the next device in the chain has an input cap.

[MartyMart]

Thank's for the tips chaps !
M.