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Kenwood tuner amp KR 2090

After 40 years faithful service the phono input has stopped working - is it repairable?



Re: Kenwood tuner amp KR 2090

Do you mean the phono amplifier section? It should be repairable, even if it uses ICs or transistors that are hard to find. Could be the power supply to the phono amp.

Re: Kenwood tuner amp KR 2090

Thanks. Yes, that's what I mean. When I took the top off it was hard to see anything amiss. I guess it needs someone who understands the manual diagrams eg can locate the power supply to the phono amp. It's been suggested an alternative would be to get a turntable with a pre-amp.

Re: Kenwood tuner amp KR 2090

Since you have lost both channels of only the phono pre-amp, I would first suspect you don't have power to it; there should be 13.5 volts at pin 17 on the pre-amp board. If that is missing there is probably a problem with the regulator, which is QM20 (2Sb595) or any of the parts in that circuit, like a zener diode or possibly a shorted capacitor (which could be on the pre-amp board).