[Jukebox-list] Re: 5U4GB and sound

On Wednesday, June 12, 2024 at 05:53:15 AM PDT, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:

When it first stopped working, I slowly pulled it out and it started > working again. I thought it was a bad connection so I tensioned > up the base sockets a little on the amp. Made no difference and > the 2 old tubes still worked ok.

Them after a few days of adjusting it's position on the base, > it stopped completely. Heater does not glow either.

If the tubes you swapped it out with work fine, I'd bet it's the filament.  Moving the tube in the socket might have jiggled it enough to momentarily make contact.