Question about Roland Microcube Guitar Amplifier

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Microcube volume kind of goes up and down itself. It is noticed when playing long notes, volume goes almost off and in next second it is ok. Any hints where to start fix the problem. another problem is that I have repairing skills based on roadeitape and hammer.

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First clean the controlls, then check for any loose components

Posted on May 27, 2011


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After playing for a while, approx 15 min, the volume dies away leaving some sound but greatly reduced. It then gradually returns to normal volume after about 3 mins. Otherwise all other functions seem to...

Such a long delay and a slow return to volume is puzzling. If the return came back in say 30 seconds, I would suspect 1/2 of the V1 tube (12AX7) might have a failure of the heater. When it has failed see if this tube has TWO points of light in it. The cooling down and warm up would give a 15 second ramp up or down in volume. This tube has a path around it that would sustain a very low volume. Try swapping one of the other 12AX7's into this spot. If the sound totally goes away replace the one that was in V1 at first place and see if problem goes away.

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