MX 110 Troubleshooting


I recently purchased a Mcintosh mx110 z series tube preamp and am having a problem with one of the channels.
Left channel has very low and then no volume when I turn the amp on. If I turn the on-off switch on and off; sometimes the sound comes back on the left channel when the switch is in off position. Then it may stay working for 20 minutes or so before it fades to no volume again.
Not sure what type of problem this could be.

Any help would be appreciated.
nikef5s

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