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Tube VHF power stage

Discussion in 'Electronic Design' started by Claus Jensen, May 17, 2007.

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  1. Claus Jensen

    Claus Jensen Guest

    Can anyone tell me where to find, or start looking for, a relatively
    modern one or two stage vacuum tube power amp that I can feed with a
    standard lab VHF generator. 15-20W output would be sufficient. Prefer
    single ended and lowest practical B+.

    Claus Jensen
  2. Tim Wescott

    Tim Wescott Guest


    Vacuum tube power stages make lots of sense when you get too big for a
    couple of transistors; they're the bee's knees if you want to go above a
    kilowatt or so.

    But 20W is well within the capability of a beefy transistor stage. What
    do you perceive as being so special about a tube amp?


    Tim Wescott
    Wescott Design Services

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  3. Claus Jensen

    Claus Jensen Guest

    In this case, I am interested in the higher output impedance tubes
    present. I would prefer not to use a matching network.

  4. joseph2k

    joseph2k Guest

    Just some questions. How much does your generator output? What is the
    bandwidth of the desired amplifier (30 MHz to 300 MHz)? Why tubes, solid
    state can do up to 1 kW even at 30 Mhz to 300 MHz. Please provide enough
    information to make reasonable design choices.
  5. joseph2k

    joseph2k Guest

    Tubes in that power and frequency range have Rp of several hundreds to some
    thousands of ohms. Transistors are much closer to 50 ohms (Rc or Rd) in
    that power range, especially some higher than needed power FET's
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