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Sounds to me like your attenuator/volume pot may be dirty. If it can be easily accessed, some electrical cleaner/lubricant may be all it needs. Something like Caig's Pro Gold.
I'm sure there are many others that members have as favorites, but the Caig's is a good starting point.
You'll want to spray enough in to penetrate into the pot, and then rotate the knob to work the fluid in. This can be done on most, if not all, of the swiches in the component.
That may solve your problem, if not, a trip to the repair shop may be in order.
Best of luck, regards,
I wouldn't use any cleaner on it. The volume control is made of all resistors. I had that same problem and it turned out the muting switch was dirty. I used a cleaner on the muting switch. It's easy to get to, right under the top cover.
As for the power supply hum. Mine always did and still does. I put a Magic Brick on it and it took away all the hum. The 3 and 3a power supplies did indeed hum. I had both.
["Sounds to me like your attenuator/volume pot may be dirty. If it can be easily accessed, some electrical cleaner/lubricant may be all it needs. Something like Caig's Pro Gold.']
Of course you're trying to help but please speak to components that you actually have a first hand knowledge of.
The AI3A uses versions of inclosed ladder resistor attenuators. Some of which have a famously short mechanical lifespan and are replaced when they become noisy.