Make a serius PA amp from old damaged amplifier

[Dbnn]

Hello there.
I have a (small) PA amp with damaged main board (bad schematic - design from factory and i cant find the schematic).
That amp produces 140w rms @ 8ohm.

Uses 6x MJ15024 per channel (maybe class B), TIP 41C/42C for drivers, TIP50 for VAS and BC546 for differrential amp.
The power supply is +/-56vDC and arround 950watt with 10000uF/80v caps
All of that parts is in excellent condition.

I want find a schematic to use that parts for one serius PA amp.
Thinking about for QUASI Amplifier for Beginners http://www.diyaudio.com/forums/solid-state/167394-quasi-amplifier-beginners.html

or something else....
http://www.diyaudio.com/forums/solid-state/167394-quasi-amplifier-beginners.html

 

[jaycee]

TIP 41C/42C for drivers, TIP50 for VAS and BC546 for differrential amp.
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No wonder it blew up.

 

[Welcome]

Those transistors cannot be original. Their SOA does not match the power supply output at all. I would assume someone tried to repair it with incorrect parts, and then it blew up again.

 

[Dbnn]

Those transistors cannot be original. Their SOA does not match the power supply output at all. I would assume someone tried to repair it with incorrect parts, and then it blew up again.

I believe that. That amp is come to me from a friend. and it was repaired. So, if we keep the output devices, what can i do?
The idea to fix the damaged cirquit is unussable because the schematic is not exist.

Sorry for bad english btw. 🙂