BA283 Blown/Troubleshooting

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Does it affect both channels? If so, then it is probably in the power supply.

Disconnect the 283s from the power supply and check for the correct voltage. If the supply is correct, then the fault lies in the 283s

Hope this helps
 
craigmorris74 said:
I've been told to check all the transistors, almost all the capacitors, and the resistors.  That means desoldering  almost every part. 

Not really,
the electrolytic squarewave for now just suggested checking for bulged or deformed, it's a visual thing in that sense
The tantalums I suggested for you to look for shorts, you use the multimeter for that.
The resistors you can do a quick check up with the multimeter looking for open resistors, visual inspection its also important.

In somes resistor you might need to desolder one of the legs, but not in all of them, and dont need to desolder them completely, one leg is enough.

No one here knows what you did, no one checked the cards also, so it's impossible to tell what the problem might be.
You have to do what we all do and it's called troubleshooting.
Troubleshooting takes time and patience, although in a simple circuit like this is something simple and not that time consuming compared to other projects.
If you feel the suggestions or troubleshooting this unit is too much work, there's no problem, just ask someone else or pay someone else to fo it for you.

There's no known things that normally go wrong in a BA283, I re-capped and serviced units that were perfectly working during more than 40 years, even with the original electrolytic caps
 
Got the meter Whoops recommended and tested the transistors from one channel.  The hfe of the 2n3055 was low-12.  Would this cause the problem I'm having (weak distorted signal, pot that controls level doesn't do anything, amps used to work when in their own case)?
 

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