MTX 81000D

[Hexhclass]

FET 237 blown ,D198 also blown along with one of the rail caps.I remove all bad parts but did not replace none.I see oscillation on the outputs but am not getting no audio output.

Any suggestions?

 

[Perry Babin]

What frequency is the oscillation on the outputs?

Do you have audio reaching pin 3 of the 5532 near LED238?

Leave D198 out of the circuit, permanently.

 

[Hexhclass]

175 khz
I see lots of noise on pin 3 no audio

 

[Perry Babin]

Do you see audio on the output pins of any of the op-amps in the preamp section?

If so, which ones?

Excessive DC on any?

Do you have a grounded shield on your signal source?