This amplifier came in with its preamp, the model 3600, both in an 'undressed' state with the covers off.
The owner had tried to find the problem after some serious smoke escaped from both pieces of equipment.
The preamp was a relatively simple fix, with a couple of transistors burnt out. Finding out which ones was the challenge, as usual.
This power amp, however, is another story.
Apparently, one channel was blown. On closer inspection, it seems that both channels are faulty.
Looking at the boards, some serious rebuilding and hacking has taken place here, with most of the transistors - in fact all types of components - swapped out for newer ones. Tracks were cut and re-patched, and some serious track burning was evident.
This meant that I couldn't trust anything about it, so a full check - component by component, and connection by connection - was the way to go.
In this video, I tackle the one channel, and take it though to testing.
Some interesting faults were discovered, so I hope this log proves informative to someone out there.
Enjoy.

You can now support the channel:
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Full info on this model:
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DIY TEST GEAR: The title says it all:
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