Tubes Asylum

EL34 power tubes life

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Do EL34 power tubes become diminished over time and need to be replaced?

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All tubes become diminished over time and need to be replaced. nt - Tre' 07:13:36 12/08/23 (7)
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- But some tubes on eBay have been "refurbished" :) nt - Triode_Kingdom 15:48:47 12/09/23 (6)
  nada aqui
  - Back in the day, they did rebuild some large transmitter tubes. nt - Tre' 18:58:00 12/10/23 (5)
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    Have Fun and Enjoy the Music
    "Still Working the Problem"
    - Pretty much any tube can be re-activated to some degree. - Victor Khomenko 05:00:54 12/11/23 (4)
      Usually that involves overheating the filament to some degree, while making sure plate current is flowing.
      - RE: Pretty much any tube can be re-activated to some degree. - Tre' 12:29:42 12/11/23 (0)
        
        In Reply to: RE: Pretty much any tube can be re-activated to some degree. posted by Victor Khomenko on December 11, 2023 at 05:00:54
        
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        Have Fun and Enjoy the Music
        "Still Working the Problem"
        https://www.cpii.com/docs/related/23/The%20Tube%20Rebuilding (Open in New Window)
      - RE: Pretty much any tube can be re-activated to some degree. - Tre' 12:00:37 12/11/23 (2)
        
        In Reply to: RE: Pretty much any tube can be re-activated to some degree. posted by Victor Khomenko on December 11, 2023 at 05:00:54
        
        No, I meant they literally rebuild the tube. It turns out they still do.
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        https://www.engineeringradio.us/blog/2010/08/rebuilt-tubes/ (Open in New Window)
        
        Edits: 12/11/23
        
        That is mostly true of expensive transmitter and generator tubes. nt - Victor Khomenko 04:55:03 12/12/23 (1)
        
        In Reply to: RE: Pretty much any tube can be re-activated to some degree. posted by Tre' on December 11, 2023 at 12:00:37
        
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        Yes. nt - Tre' 07:38:23 12/13/23 (0)
        
        In Reply to: RE: That is mostly true of expensive transmitter and generator tubes. nt posted by Victor Khomenko on December 12, 2023 at 04:55:03
        
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        Have Fun and Enjoy the Music
        "Still Working the Problem"
RE: EL34 power tubes life - The Dill 05:52:47 12/08/23 (0)
Yes.

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