When you turn on the Kenwood A-58 amp the volume is always very low. From any sound source. After 20 minutes the volume gradually recovers and never drops again
According to service lit on your amp this is a class A amplifier that uses a push pull configuration, measure the bias voltages when it doesn't have sound and compare them to when it's working, I'd suspect something in the driver circuitry
Question edited for maker name.
Question moved to Kenwood.
Sounds like bad capacitors that perk up when they get warm.
Or the volume control needs cleaning with electrical switch cleaner.
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