Tubes Asylum

• RE: Matched output tubes in a fixed bias amplifier - Caucasian Blackplate 09:49:48 08/31/15 (2)
  In Reply to: RE: Matched output tubes in a fixed bias amplifier posted by elflow on August 31, 2015 at 09:32:17

  Matched transconductance gives you better AC balance between the output tubes.
  
  Adjustable fixed bias for each tube gives you good DC balance between the output tubes.
  

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  • RE: Matched output tubes in a fixed bias amplifier - elflow 06:36:08 09/01/15 (1)
    In Reply to: RE: Matched output tubes in a fixed bias amplifier posted by Caucasian Blackplate on August 31, 2015 at 09:49:48

    Thanks, I was questioning because vintage kits rarely if ever supplied matched pairs of output tubes, nor mentioned replacing output tubes with matched pairs in their manuals. Today many owners of tube amps obsess about matching everything as closely as possible for best potential performance.
    

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    • RE: Matched output tubes in a fixed bias amplifier - Caucasian Blackplate 08:47:29 09/02/15 (0)
      In Reply to: RE: Matched output tubes in a fixed bias amplifier posted by elflow on September 01, 2015 at 06:36:08

      If you went to a drug store back in the day to buy a new tube for your amplifier, but you were lead to believe that you absolutely had to have a transconductance matched pair, where would you get them?
      
      You would need to obtain them from the military or a university laboratory at that point, which was pretty difficult.
      
      The internet now affords us such luxuries.
      

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