[HAM] Percussion

[Dave Bishop]

I guess I would swap the 6C4 tubes with one another and try a new 12AU7 tube 
in the V7 spot. That should diagnose whether one of the tubes is bad  Then I 
would check the percussion decay screw to verify that its near the middle of 
its travel.  If that makes no difference, you can search the archives for 
the procedure(s) for "zapping" the percussion circuit, which will 
(temporarily) destroy the dentrites growing in the percussion switches that 
are shorting some signal to ground.  Post back if you need further help.

Regards,

Dave Bishop