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Testing a Thyratron

Discussion in 'Electronic Repair' started by N_Cook, Jan 8, 2009.

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  1. N_Cook

    N_Cook Guest

    New one to me. 6K25 tested on an Avo CT160.
    Data for 30mA, 100V settings is , under mA/V column 2K ohm.
    neg grid voltage is undoubtably 4.1V, above that and meter swings below 0
    and below 4.1V it swings over fsd.
    What is the 2K figure, do you have to take and graph out values around the
    "flash over" point ?
  2. N_Cook

    N_Cook Guest

    I should say I started with setting of 40V then 60, then 75, 90 and finally
    100V. Didn't note it but the -4.1V trigger voltage appeared at 60V , I
    think, and hardly changed. Just for the archives - as thyratron testing is
    not very kind to test-sets. I could not decide whether to start with lower
    current setting , but decided to set at the data criterion of 30mA and vary
    the anode volts. Switching to test and back as quick as possible to save the
    meter movement.
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