[HAM] (UPDATED) OT: Traynor YGM-3 Guitarmate Amp

[Scott Hawthorn]

At 08:13 PM 4/9/2008, Daniel Ramirez wrote:
>Well, A small white-hot fire started on pin 7 of one of the EL84s 
>today.  Perhaps if one of you tech geniuses looks at the schematic 
>(http://www.lynx.bc.ca/~jc/730911_YGM3_4.gif) it will be apparent what the 
>problem is. While we are at it, if anyone could recommend some good study 
>material on audio electronic theory I'd appreciate it.  I am pretty quick 
>with this stuff, always shined in physics classes, but I still can't look 
>at a circuit diagram and really "get"what everything is doing.
>
>Thanks a lot,
>dan

Until an actual "tech genius" responds, I'd replace the electrolytic power 
supply caps as a start. There's a good chance they are shot after thirty 
years, and they do supply voltage to the center tap of the output tranny, 
and hence to those tubes. After that, check the voltages as specified on 
the schematic.