[morzh]

So, they were cooked after all.

Now, if you keep touching various tranistors' bases moving back from output to input you should hear AC hum. Like Q4 and then Q2.
While Moving back you could see where it stops and see why. If all touches within the power amp yield hum, start moving back to preamps and do the same, go backwards touching bases.

You could check plenty with one side, it should play and this is what you are after.
Don't worry about hum right now, it may simply be the result of it bing not fully assembled.