[sdiy] Symetrix A-220 troubleshooting

[Tavys Ashcroft]

Not exactly a synth...but I'd use it to listen to one.

I just got a Symetrix A-220 stereo amplifier dropped on me (ow) and 
it looks nice and clean inside and out.  Unfortunately, there's a not 
so nice hum and no audio.  It's the same volume (loud) no matter 
where I turn the volume knobs.  I'm assuming this is the power supply 
capacitors?  It doesn't look to have any sort of voltage regulator in 
the power supply, just big fat 6800uF capacitors and a bridge 
rectifier.  I haven't tried leaving it on long enough to crank the 
input to it to see if I can get any audio out at all.  The hum is 
really loud and I live in an apartment.  I'm hoping that it's just an 
ungodly level of ripple on the DC going to the amplifier and that's 
all.  Any thoughts?

-Tavys