This is an interesting discussion and I'd like to add my two cents worth. The Western Electric 274B and 422A rectifier tubes as replacement for the 5U4 are highly coveted by audiophiles and guitarists for their sonic qualities and demand good money. Those with tuned ears can definitely tell the difference in sound quality produced by those tubes over the readily available and less expensive 5u4. My seventy-plus-year-old ears could probably not discern the difference anymore. Ah, such is youth. Here's and interesting discussion on 5U4G replacements: https://www.audionirvana.org/forum/the-audio-vault/accessories/vacuum-tubes/... Dean
On Wednesday, June 12, 2024 at 10:04:51 AM PDT, M De Simone via Jukebox-list jukebox-list@lists.netlojix.com wrote:
This is new to me and I would love to hear the theory behind how a rectifier tube could affect the sound quality. I’m not doubting it I just don’t know enough to understand how this happens. As I far as I know the 5U4 creates a voltage needed in the amplifier, this tube has no gain qualities and if it’s good the voltage is there, if it’s defective there would be no voltage and the amplifier wouldn’t work. I find this interesting as I never considered it could affect the sound. I’d be interested in hearing an explanation from someone who knows more about this than me. Thanks, Mauro
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On Jun 12, 2024, at 11:43 AM, David Breneman via Jukebox-list jukebox-list@lists.netlojix.com wrote:
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.
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