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• I get too excited at times - Neff 05:31:26 12/25/08 (2)
  In Reply to: RE: Talk about upgrading tube tuners lately posted by stellavox on December 25, 2008 at 05:00:47

  Various NOS tubes do not change the receive sensitivy much, just the sonics. Now, the small internal capacitance variances of RF tube can effect receive sensitivity a small amount on some applications.
  
  

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  • RE: I get too excited at times - BFitz 07:30:31 12/27/08 (1)
    In Reply to: RE: I get too excited at times posted by Neff on December 25, 2008 at 05:31:26

    Be careful; to fully evaluate RF or IF tubes on an even playing field, you need to re-align the RF/IF stages after every swap. The tuned circuits will respond differently to the slight changes in tube GM, capacitance, plate resistance etc. from variations in physical construction. And RF and IF stage tuning will certainly affect the distortion signature and separation.
    Bob
    
    

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    • RE: I get too excited at times - Neff 10:56:26 12/27/08 (0)
      In Reply to: RE: I get too excited at times posted by BFitz on December 27, 2008 at 07:30:31

      I always realign tuners when swapping out tubes in the I.F., R.F. and multiplexer plus other parts as applied to same circuits too.
      
      

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