HAMPAMP TUBE AMP SERVICES

I think PaoloJM hit the nail on the head, sounds like a bad solder joint. If the rectifier was flaking out it would affect all the preamp tubes. One way to check to see if it is a bad solder joint would be to gently grasp the second tube when it doesn't light, and gently again, wiggle it slightly to see if it comes on. That is by no means a cure but it would indicate a possible bad solder joint. If you or a friend are/is handy with a soldering iron it may be an easy fix but there are lethal voltages present even when the amp is off and unplugged, the filter caps need to be drained before poking around inside the amp.

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