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About bt0200

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  1. D75

    Hello, I should have schematic for an old D75 (not D75A). Serial no is 16202. Want to restore it. One channel is working the other is almost quiet and heavily distorted. I have got a copy of a D75A schematic from your representative here in Germany (AudioPro). But at home again, I noticed that it doesn't match my amplifier. I think, they do not have any other schematic because I told them that I have got an old D75 and they didn't ask for the serial number. Mine uses 2 dual-opamps (RC4558 and presumably MC1303, which once has been replaced by a TBA231). The schematic shows a single quad-opamp (MC33079). I would appreciate also a notice how to adjust bias current. Thanks in advance Klaus