Tube suggestions for 811H

Discussion in 'Amateur Radio Amplifiers' started by AC2MM, Dec 30, 2018.

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  1. AC2MM

    AC2MM Premium Subscriber QRZ Page

    I think I may have a bad tube in my 811H.
    Where would you guys suggest I go to buy a good pre-tested matched set?

  2. K7TRF

    K7TRF Premium Subscriber QRZ Page

    They don't really need to be matched in the 811h design but I'd look at RF Parts for their warranty on tubes:
    WA7PRC likes this.
  3. N2IIE

    N2IIE XML Subscriber QRZ Page

    I purchsaed a matched quad of new Penta 811A Tubes on Ebay and they have worked fine for the last six months.
  4. N7WR

    N7WR Premium Subscriber QRZ Page

    RF Parts
  5. AC2MM

    AC2MM Premium Subscriber QRZ Page


  6. W1BR

    W1BR Premium Subscriber QRZ Page

    Have you considered upgrading to 572 tubes instead of the 811A?
  7. AC2MM

    AC2MM Premium Subscriber QRZ Page

    Are you kidding?
    $82.00 apiece, nope I have not even slightly considered it.

    But what I did find is a SS washer laying in the bottom next to one of the tubes.
    It's supposed to go between the board and the ceramic tower. So I reinstalled all the tubes, and I no longer am blowing fuses, but one of the tubes is not lighting up. That was probably the one laying next to the washer.

    I'm going to call HRO and ask if this is a warranty issue.
    Last edited: Dec 31, 2018
  8. KQ9J

    KQ9J Premium Subscriber QRZ Page

    If you do wind up needing to order a new tube or tubes, I would go with RF Parts. I bought a set of 4 for my 811H back in September of 2015 and they are still going strong with the output that they had when newly installed.
  9. KD2ACO

    KD2ACO Platinum Subscriber Platinum Subscriber Life Member QRZ Page

    Have you tried a tube that lights in the “dark” socket position? Just curious...
  10. K9STH

    K9STH Ham Member QRZ Page

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