Sick Marshall, need help

[tinpan]

Hello I have a Solid State Marshall Valvestate VS230 that I need help with, I do have the schematic. It started with a high pitched "pop" when powered on, but it would play fine. Then it developed a squeal. I have electronics background so I opened it up and found 2 resistors had gotten hot and turned brown. R10 and R18 both 10 ohm 1/2w, I replaced them along with 2 2.2uf/50v caps in the circuit and the 2 power output IC's TDA2050. But it got worse instead of better, now it sounds as if Im playing through wax paper much like a kazoo. If anyone knows about solid state amps and what could be the problem here, any help is appreciated. I can email you the schematic if you like.
Don

[J M Fahey]

Start by attaching the schematic here, so it's available to everybody.

[tinpan]

Trying to attach schematic

[tinpan]

The "Kazoo" effect was bothering me and made me think (Blown Speakers??) so I plugged in the headphones and the guitar sounds good, nice & clear, small hum in the OD channel but not bothersome I'll hunt down that problem later. Can anyone concur? Bad speakers?

[Enzo]

Connect the speakers to some other amp and find out.  Likewise, connect this amp to some other speaker system and see if the amp sounds OK.

[tinpan]

I will try that, thanks