I added some caps to my preamp some time ago and had a similar problem.
While putting things all back together a lead was inadvertently bent over and ended up almost touching the chassis.
Tapping the chassis or tubes caused the lead to momentarily contact the chassis and produce a thump through the speakers.
When the lead was moved clear of the chassis the problem disappeared.
Cheers,
Alex
While putting things all back together a lead was inadvertently bent over and ended up almost touching the chassis.
Tapping the chassis or tubes caused the lead to momentarily contact the chassis and produce a thump through the speakers.
When the lead was moved clear of the chassis the problem disappeared.
Cheers,
Alex
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