One burnt main transistor, with a blown leg, TR525 blown leg, resistor R551 blown.
I'm a second owner of this amp, somebody "tried" to repair it already. I've removed few carbonfilm resistors because they showed nothing on DMM. Also metallized paper caps went out the window. Total recap is in order of course and I'll change the carbon resistors for something better.
Question is, when I get to it, what are the pre-transistors that affect the sound the most? I've read that these need to be gain matched if it comes to that, how to do that the easy way?
Power transistors gotta go also because original SanKen's are hard to get and crappy anyway. Good subtitutes (what I've read and heard): 2SA1492 -> 2SC5242 or 2SC1962 and 2SC3856 -> 2SC2723
That's a problem for another time, but any tips and tricks how to proceed after changing all the crap from the board and repairing some damage, are welcome.
I'm a second owner of this amp, somebody "tried" to repair it already. I've removed few carbonfilm resistors because they showed nothing on DMM. Also metallized paper caps went out the window. Total recap is in order of course and I'll change the carbon resistors for something better.
Question is, when I get to it, what are the pre-transistors that affect the sound the most? I've read that these need to be gain matched if it comes to that, how to do that the easy way?
Power transistors gotta go also because original SanKen's are hard to get and crappy anyway. Good subtitutes (what I've read and heard): 2SA1492 -> 2SC5242 or 2SC1962 and 2SC3856 -> 2SC2723
That's a problem for another time, but any tips and tricks how to proceed after changing all the crap from the board and repairing some damage, are welcome.
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