Chinese 811A and 572B tubes possible cause of early failure

Discussion in 'Amateur Radio Amplifiers' started by N8FVJ, Jul 18, 2019.

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  1. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    I believe he is referring to People Emitting Thoria Allthetime
     
    K2XT likes this.
  2. KM1H

    KM1H Ham Member QRZ Page

    Those failures were traced to contamination during tube assembly in a dirty environment
     
  3. W1QJ

    W1QJ Ham Member QRZ Page

    You seem to know so much about all this that you should be able to replicate the old Cetron 572B product. For heaven sake do it!
     
    K2XT likes this.
  4. N8FVJ

    N8FVJ Ham Member QRZ Page

    It would cost over $50K for the equipment to make a vacuum tube.
     
  5. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    It's so sad that there really aren't local "tube stores" around anymore.

    I used to have fun as a kid calling a store, "Do you sell tubes?" and they'd answer "of course!"

    "Put aside a couple of fallopians for me, I'll be there in an hour...":)
     
    KA9JLM likes this.
  6. KM1H

    KM1H Ham Member QRZ Page

    Some have built working tubes on their kitchen table. Some have rebuilt tubes at home. And some remain clueless.
     
  7. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    When I tried to build a tube in the kitchen, it came out like a baked ham.

    It was delicious, though.
     
  8. KM1H

    KM1H Ham Member QRZ Page

    Kosher is best and Im not even Jewish but raised around many, in Brooklyn and later out "on the Island"
     
  9. W1QJ

    W1QJ Ham Member QRZ Page

    I was born in Coney Island. One block away from Surf Avenue (AKA 'the boardwalk") Nathan's was right there along with Steeplechase and the famous parachute ride. I'll never forget the "peanut whistle" from the guy selling roasted peanuts to the entrance of the boardwalk. Those were the days.
     
  10. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Thoria is an acceptable and understandable shortening of Thorium similar to Cupro or Ferro, etc. especially as a shorthand encompassing the possible Thorium compounds that might be used such as Carbonate, Borate or Calcite since I doubt metallic Thorium is used. Anyone with the slightest familiarity with chemistry can comprehend what is referred to.
     
    KM1H likes this.

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