Considering all those personal names of testers/inspectors labelled inside.
a 1962 from 2003. A history of blowing fuses then would work for months then
blowing again. Is there a name for them , the little bits of wire of
cropped-off component leads. Anyway under the tremolo valve base , probably
sort of spot welded just the solder blob end , to one of the tags. A 5mm
long piece of cropped off lead from a 1W resistor or similar. It could swing
across, as only vaguely atached, and short the tags between a cathode and
anode. I assume it was loose somewhere inside the amp and then bounced into
just the wrong spot and current passing was just enough to just "solder" in
place on the first shorting excursion

Heh... good catch!

I once had to debug a NAD stereo receiver I'd bought, used... bad
crackling and popping on occasion, especially when tapped or banged.
Like a lot of Japanese kit from a couple of decades ago, it had quite
a few through-hold resistors in a "vertical" mounting position. Two
had leaned, or been bend over just enough that their flying upper
leads could make contact... POP!

--
Dave Platt AE6EO
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