Henry 5k appears to be showing no plate current and shows high grid

Discussion in 'Amateur Radio Amplifiers' started by W7UJ, Nov 25, 2021.

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  1. W7UJ

    W7UJ XML Subscriber QRZ Page

    Thanks Steve for your help, I ll get someone to check it out and let you know what I find.

    Thanks again Ed W7UJ
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    It would be good to know what caused a 3A cathode fuse to blow, even once.

    Usually an arc. If that's just dust in the RF cage, or exploding a bug or something it's no big deal...but if it's an ion arc inside one of the tubes, that can mean the tube is failing and should be replaced.

    3CX1200A7s are extremely rugged tubes and I've never actually seen one fail, but anything's possible.
  3. K1LKP

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    Last edited: Dec 2, 2021

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