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03-20-2020, 01:33 AM
Hi Kevin,
As can be seen from the attached photos; the amp is in a sorry state internally. This is how my friend bought it.
I have since cleaned it up a lot, but it will need more to be acceptable.
You can see the charred section of the PCB near the Bias circuitry.
I don't know the cause of this damage but, after further testing, I have found that the PCB is conductive in this area.
The owner wants to either, fix it and sell it or, use what can be salvaged to make him a new high gain amp.
He is an honest bloke and won't onsell a dodgy amp; but, if I continued to use the PCB, I would also have to replace a lot of the known unreliable components used in these amps.
This would be a rather costly job and he may not recover the costs considering that he paid $750 for this amp, as it is.
I am now faced with either, isolating the charred board from the local circuits and making a remote Bias board to feed the PI and PA valves directly from the new board and hoping that there won't be other dramas, or to junk the whole PCB and reuse the hardware for a whole new amp.
Thanks for your time,
Noel
As can be seen from the attached photos; the amp is in a sorry state internally. This is how my friend bought it.
I have since cleaned it up a lot, but it will need more to be acceptable.
You can see the charred section of the PCB near the Bias circuitry.
I don't know the cause of this damage but, after further testing, I have found that the PCB is conductive in this area.
The owner wants to either, fix it and sell it or, use what can be salvaged to make him a new high gain amp.
He is an honest bloke and won't onsell a dodgy amp; but, if I continued to use the PCB, I would also have to replace a lot of the known unreliable components used in these amps.
This would be a rather costly job and he may not recover the costs considering that he paid $750 for this amp, as it is.
I am now faced with either, isolating the charred board from the local circuits and making a remote Bias board to feed the PI and PA valves directly from the new board and hoping that there won't be other dramas, or to junk the whole PCB and reuse the hardware for a whole new amp.
Thanks for your time,
Noel
