• Re: Interstage Transformer Nomenclature - danlaudionut 13:03:42 01/16/05 (0)
  In Reply to: Interstage Transformer Nomenclature posted by Sidewinder on January 14, 2005 at 11:15:33:

  Sidewinder

  first
  1:1 is the voltage ratio input:output
  but the design is a bit confusing on this point
  so I researched it on the net and it is
  indeed used as a 1:1 transfomer

  second
  you need to know what impedance
  the tube needs to perform well
  sometimes they combine the two and say 5K:2.5K
  which is the impedance ratio
  a 2:1 impedance ratio will equate to a
  1:.7 voltage ratio (square root of difference)
  6L6 likes ~5K primary impedance
  (from data sheets)

  third
  there is the voltage swing
  voltage needs to be below the
  saturating point of the core
  6L6 has a 20V bias with a gain of 8
  so you have a 160Vpk/112Vrms voltage swing

  fourth
  there is the current going through it
  which determines the size of the air gap
  so that the DC current doesn't saturate the core
  namely 28mA in this case

  so what you are looking for is:
  a 5K 1:1 transformer that can
  handle a 112V signal level
  with a current of 28mA

  FWIW
  DanL
  
  
  
  

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