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tube matching

  1. Walter R

    Tube Matching - TV-7 vs Plate Current

    There are two methods commonly used to perform tube matching, using a tube tester or by measuring in-circuit plate current. The tube tester would seem preferable, but my TV-7 measures transconductance at a plate voltage of 150 vdc while the in-circuit plate voltage is nominally 440 vdc. So I...
    • Walter R
    • Thread
    • plate current tube matching tube tester
    • Replies: 4
    • Forum: Tube Audio
  2. Walter R

    Tube Matching Question

    I just bought a tube socket adapter to measure the zero signal plate current in the two 6L6s in push-pull operation in each of my two HF-20 amplifiers. The venerable RCA tube manual says the typical zero signal plate current is 116mA for a Class AB1 amplifier in push-pull operation at 450v...
    • Walter R
    • Thread
    • tube matching tube plate current
    • Replies: 6
    • Forum: Tube Audio
  3. klamsoss

    X-100-B tube matching help needed

    I'll do a full write up this summer when my resto-mods are complete, but I need some help to get there. A trusted tech in TX made my unit functional. The work was just fine, and I have really enjoyed the few hundred hours of listening, so far. So much so that I'm ready to take it to the next...
    • klamsoss
    • Thread
    • fisher tube matching x-100-b x100b
    • Replies: 15
    • Forum: Fisher
  4. Salbreth1

    Tube checker recommendation... Again

    So I'm looking for a checker that will do a variety of tubes as well as output matching. I'm fairly new to the tube world but from what iv read Hickok is one of the go to brands. I have a $600 budget and am looking at a calibrated 752A and an 800. Both are transconductance models. The first...
    • Salbreth1
    • Thread
    • hickok output tubes tube checker tube matching
    • Replies: 18
    • Forum: Tube Audio
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