Heathkit A-9C Integrated amplifier 6L6 output tubes

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Picked this amp up at an estate sale. The amp looks good but does not work. All the tubes test good so there must be another problem. This unit was made about 1960 so I suspect one of the capacitors is bad. Good chance to experiment with a tube amp if you are interested. Has two 6L6 output tubes a 12AX7 and two 12AU7's and a 5U4G. All tubes test good. The transformers look good. The amp puts out a very slight hum but no music.