Sony TA-1130 AMP and initial HUM when powered up


Was wondering if I should be concerned, adjust, ignore this 'new to
me' Sony amplifier I just hooked up.

It's the one I mentioned in a recent thread on driving a dvc sub.

When I turn the thing on it makes a click or snap (I expect this) and
then it hummmmms for about 30 to 60 seconds.

It seems to quiet down at it 'warms up' but I think there is a
persistent (if lesser) hum going on all the time.

Any care and feeding tips appreciated.


TBerk

.

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