Constant 12v switching ps. No scope for the moment, only a graphic multimeter thats shows 30khz but cant see the waveform.
4.4 volts on all ps gates. The swithing transistors also replaced with 1gm and 2gm instead of za and zc. I use these transistor all time but not sure if its a problem on this amp.
4.4 volts on all ps gates. The swithing transistors also replaced with 1gm and 2gm instead of za and zc. I use these transistor all time but not sure if its a problem on this amp.
The diode is ok. Sounds good some seconds then stills sound but with a high pitch noise in the back. The amp nows dont stop and dont protects. When i turn off with the remote wire the noise stills sound like a cap discharging.
I need to rest the amp a lot of time then turn on again sounds ok some seconds and the noise come back.
I need to rest the amp a lot of time then turn on again sounds ok some seconds and the noise come back.
Updated
I try to repair again today. Ir2101 both replaced, missed diode replaced with 1n4148, both 10 ohm resistors, 1/2 rail voltage on both outputs. Plays fine no heating not strange sounds only humming sound all time but it stops when i jumps the rca shield to amp ground. I have 100kohm betwen ground and shield. Any ideas what is the problem here??
Thankss
I try to repair again today. Ir2101 both replaced, missed diode replaced with 1n4148, both 10 ohm resistors, 1/2 rail voltage on both outputs. Plays fine no heating not strange sounds only humming sound all time but it stops when i jumps the rca shield to amp ground. I have 100kohm betwen ground and shield. Any ideas what is the problem here??
Thankss
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