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Crate Vintage Club 20 gives a free light show

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  • Crate Vintage Club 20 gives a free light show

    My Crate Vintage Club 20 (VC2110) sounds loads better with a new set of tubes: Sovtek 12ax7 in V1, EH 12ax7 in V2, and two fresh JJ EL84's in the power section. While the tone, response, and timbre are largely superior than before, I am perplexed by its latest behavior ... Exhibit A

    What are your thoughts?

  • #2
    I got curious and swapped the EL84's around; it is just the one tube that flashes.

    Is it possible that the cathode and filaments are getting too friendly with one another?
    Last edited by brendo613; 02-11-2010, 09:53 PM.

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    • #3
      Some tubes just do that. The left-over bits of heater wire sticking out of the cathode flash at turn-on, then dim down as the rest of the heater comes up to temperature.

      As far as I know it's not harmful. There have been several threads on it before, try searching the forum.
      "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

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      • #4
        I came off as a board newbie! My apologies; in my defence, I actually did find some pages mentioning this phenomenon, both on here and other boards - but they all appeared to pertain to preamp tubes exclusively. I thought that it might be of a little more worry for power tubes, but your theory sounds plausible. Odd - guess I just enjoy the light

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