Harman Kardon is still in business. It is owned by an audio conglomerate named Harman of all things. It consists of AKG, JBL, Infinty, Harman Kardon, Mark Levinson and maybe others. They still offer a stereo receiver in fact. A repair or support on a preamp over 20 years old is questionable but it can't hurt to ask them if they can direct you to the answer.
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