Here's an interesting little project and schematic.

[Bluesgeetar]

I found this little job while I was hunting for some info on some strange transistors I got from that guy in Italy.  He sent me some ancient G.E.C. S1   PH marked trannys.  I thought someone might get some use out of this.  :mrgreen:

http://semiconductormuseum.com/ConstructionProjects/ConstructionProjects_Penfield_MiniAmp_Page3.htm

http://semiconductormuseum.com/ConstructionProjects/ConstructionProjects_Penfield_MiniAmp_Page4.htm

Or it could be SI  PH?  I can't read it that well.

[petemoore]

Anyone ever hear of trying something with the power supply to introduce soem interesting, usable influence on the sound?
 Doesn't have to be anything in particular.
 With all the PS Ripple troubles woes, I'd think there might be something in PS modulation. ??Something like the way a GZ34 rectifier tube works or something else, completely unrelated...
 
 All you'll get is noise?
 At the very least could I vary headroom on the booster using a variable voltage regulator withought too much troubles or might noise be an issue there?

[petemoore]

Looks pretty straight foreward...
 4w from a Ge transistor.  .  .!
 Please Excuse the above posts not being in their own thread/...