The rail voltage is normal until the amp oscillates.
Without a list of all of the regulator voltages, it will be hard to help troubleshoot that problem.
Without a list of all of the regulator voltages, it will be hard to help troubleshoot that problem.
Q2000
Base:0.00
Collector :-26.93
Emitter:-6.21
Q2001
Base:-0.15
Collector :1.50
Emitter :-0.17
Q2010
Base:1.23
Collector:1.75
Emitter:-10.13
Q2012
Base:1.23
Collector:1.60
Emitter:3.60
These readings are with the output board in .
I can remove it if needed to see if all the voltages are correct on the regulators
Base:0.00
Collector :-26.93
Emitter:-6.21
Q2001
Base:-0.15
Collector :1.50
Emitter :-0.17
Q2010
Base:1.23
Collector:1.75
Emitter:-10.13
Q2012
Base:1.23
Collector:1.60
Emitter:3.60
These readings are with the output board in .
I can remove it if needed to see if all the voltages are correct on the regulators
it appears that you have a bad connection between R9 and the collectors of the regulator transistors that have 20v normally (possibly 27v with no driver board).
I will check to see if I can find the bad connection . What should the voltage be on the collector of Q2000
There were multiple versions of this amp.
Yes for the caps.
Was R9 originally used in your amp?
Yes for the caps.
Was R9 originally used in your amp?
In amps where R9 wasn't used, the supply voltage for the regulators in the photo is taken from the output of the 15v regulator U1000. In those amps, R61 passes the voltage from the 15v regulator to the regulators for the drive board. R60 isn't used.
I resoldered all resistors back into place .
The version I have R9 isn’t used . So C1019 isn’t used also correct ?
The version I have R9 isn’t used . So C1019 isn’t used also correct ?
I’m at a loss with this amp so far .
if I connect a test sub to the speaker terminals all I get is a loud farting noise through the test sub .
With the output board in the amp the voltages on all the regulators is less then 1 volt on the base and emitter legs
if I connect a test sub to the speaker terminals all I get is a loud farting noise through the test sub .
With the output board in the amp the voltages on all the regulators is less then 1 volt on the base and emitter legs
I’m wondering if one of the regulators is defective .
i pulled Q2001 so the amp would stop hissing at me .
Here is what I get on the rest of them .
Q2000
Base:-6.80
Collector:-26.72
Emitter:-6.24
Q2012
Voltage jumps all over the place on all 3 legs
Q2010
same voltage jumps all over the place
Q2001
on the pads I get
Base:6.81
Collector :-13.22
Emitter0.53
i pulled Q2001 so the amp would stop hissing at me .
Here is what I get on the rest of them .
Q2000
Base:-6.80
Collector:-26.72
Emitter:-6.24
Q2012
Voltage jumps all over the place on all 3 legs
Q2010
same voltage jumps all over the place
Q2001
on the pads I get
Base:6.81
Collector :-13.22
Emitter0.53