Its a amazing amplifier. I have restore my own 578. And everything is ok now. Take care to buy things from china. Its fake what they sell on Ebay for low budget. If you want to repair things I have some follow information for you.
Q202 equivalent=OPA627 from (Burr and Brown) BB.
Q205 equivalent=BC639 1 watt
Q209 equivalent=BD244C +15 watt
Q208 equivalent=BD243C +15 watt
Q206 equivalent=BC639 1watt
Q207 equivalent=BC640 1watt
Q211 till Q215= MJ15024G 200 watt by 400 volt.
Good-luck if you have to repair it.
Wim
Q202 equivalent=OPA627 from (Burr and Brown) BB.
Q205 equivalent=BC639 1 watt
Q209 equivalent=BD244C +15 watt
Q208 equivalent=BD243C +15 watt
Q206 equivalent=BC639 1watt
Q207 equivalent=BC640 1watt
Q211 till Q215= MJ15024G 200 watt by 400 volt.
Good-luck if you have to repair it.
Wim
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