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    volume control doesn't reduce one channel to zero. In a few seconds it almost does...

    Hello! I have a Heathkit AR-15 receiver. I recently began having this problem: The volume control does not reduce the volume to zero, on one side only. The right side If I turn the unit on right after turning it off, there is sound there at a pretty high volume, which drops after the...
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    Can't quite figure out the function of the fourth terminal on a potentiometer.

    The attached fragment of a circuit is for the preamplifier board of a Heathkit AR-15 receiver. The volume control potentiometer has a fourth terminal. I can see that it has something to do with the Loudness (bass-enhancement) control, which is either on or off. Something is bypassed when the...
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    Heathkit AR-15 sound problems

    Hi all. I have this Heathkit AR-15 here, and it has had this symptom: One channel takes a good fifteen seconds to come fully alive. It moves from zero sound through distorted sound to full-on sound. But then at intervals it gets distorted again. I think it has finally decided to die, though...
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    Heathkit AR-15 receiver - problem with multiplex circuit

    Hello. I have a Heathkit AR-15 receiver which has a procedure for aligning the multiplex circuit, written in the manual. I follow this procedure, the last step of which is to adjust a choke until the sound goes from garbled to clear. I have done this several times. Each time the FM works fine...
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