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Thank you all; I will try the caps and report the result.

My old Roland BOLT-60 has been sitting in the BR closet for years. I finally got it out, cleaned it up and and plugged it in. It powers on, but when I wait 20 or so seconds (like the manual says) and flip the standby switch there's a 60Hz hum, which none of the pots affects at all. It stays humming ...