McCormack DNA Losing Sound Volume

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My McCormack DNA 0.5 (Deluxe) amp recently developed an intermittent problem with sound volume on the right channel: its sound volume would suddenly drop significantly for ~3-5 minutes and then comes back, then goes through the same cycle again after another ~5-10 minutes.

I would really appreciate any pointer on what might be causing this problem.

TIA.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.