Board 1325-51669-06
Power supply output transistors replaced with irfp064n
Power supply drive transistors replaced
Output transistors replaced with Irfp260n
Amp comes on and plays but has noise on all op amps and drive signals.
When I connect my scope to the positive speaker output while playing a 40hz signal into the amplifier I see the signal on the output but it clips the positive voltage unless at very low volume and there is a squealing noise coming from what sounds like either t201 or t200.
here is what the speaker output signal looks like when a 40hz signal is played into the amp.
the last photo is the same 40hz signal but at a very low input voltage.
I’ve exhausted my knowledge and could use some help.
Power supply output transistors replaced with irfp064n
Power supply drive transistors replaced
Output transistors replaced with Irfp260n
Amp comes on and plays but has noise on all op amps and drive signals.
When I connect my scope to the positive speaker output while playing a 40hz signal into the amplifier I see the signal on the output but it clips the positive voltage unless at very low volume and there is a squealing noise coming from what sounds like either t201 or t200.
here is what the speaker output signal looks like when a 40hz signal is played into the amp.
the last photo is the same 40hz signal but at a very low input voltage.
I’ve exhausted my knowledge and could use some help.
