Tube DIY Asylum

• RE: In defense of the "universal driver tube" - Paul Joppa 20:54:34 12/06/24 (3)
  In Reply to: RE: In defense of the "universal driver tube" posted by PakProtector on December 05, 2024 at 05:35:48

  My current amps have a trimpot as the cathode resistor for just that reason. :^)
  

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  • RE: In defense of the "universal driver tube" - mwhouston 17:37:08 12/07/24 (1)
    In Reply to: RE: In defense of the "universal driver tube" posted by Paul Joppa on December 06, 2024 at 20:54:34

    Trim pot, I'll assume wire wound.
    | retro-thermionic |
    
    

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    • RE: In defense of the "universal driver tube" - Paul Joppa 08:49:43 12/08/24 (0)
      In Reply to: RE: In defense of the "universal driver tube" posted by mwhouston on December 07, 2024 at 17:37:08

      No, just cermet. It's bypassed, so I figure any sonic difference is greatly reduced. Possibly not as long-lived, though.
      

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  • RE: In defense of the "universal driver tube" - PakProtector 17:35:17 12/07/24 (0)
    In Reply to: RE: In defense of the "universal driver tube" posted by Paul Joppa on December 06, 2024 at 20:54:34

    The first linestage I built eventually got converted to run a pair of 12B4's. These were run with what looked like not enough cathode bias( most of the B+ dropped across the plate loads ). Dropping in 12A4's resulted in about the opposite.
    
    I was quite surprised how well both worked in that circuit.
    
    Douglas
    
    Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
    
    

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