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Heater center tap

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  • Heater center tap

    In my design I'm switching power tubes via the cathodes. They are cathode bias. I have a large resistor in series w/ Rk and Rc which I'm bypassing via a switch to turn them on/off. I also have the filament center tap DC referenced at the cathodes. Now if the 10k series resistor is in play and the tubes are off the voltage on the cathodes will be far higher than the 32v they are at when on. My question is: Is there a max voltage for a DC referenced filament center tap? My thoughts are no, but I'm not really sure.

  • #2
    From Wizard's recent thread, bottom of tubewell's post:
    http://music-electronics-forum.com/t17071/#post139358

    In JJ's ECC83S tube data sheet, they spec the max U k/f voltage at 180v.
    http://www.jj-electronic.com/pdf/ECC%2083%20S.pdf

    So I would say that yes, there is a max, and it depends on the tube.
    -Mike

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    • #3
      ahh yes. Why didn't I think to check the datasheet? Cause I'm an idiot. Forgot they put that in there.

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