Musicians Roadhouse

My JH has started making a pop noise. The pop occurs one time (in maybe an hour or two hour session), maybe ten or more minutes after switching off standby. No static or other unusual racket. This has occurred three times, while watching tv baseball and playing scales, so very low volume, no effects. Does anyone have any thoughts about the cause/cure? Original tubes. Thanks!

Hi, My guess would be tube related or the tv could be interfering was anybody switching things on or off in the house?

does not sound like anything too serious and should be an easy fix.

best wishes cc

Thanks for the response. Its probably time for retube and bias in any event.