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classic p-p 812A homebrew issues

Discussion in 'Amplitude Modulation' started by KC2ZFA, Aug 29, 2021.

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  1. K5UJ

    K5UJ Ham Member QRZ Page

  2. K4KYV

    K4KYV Premium Subscriber Volunteer Moderator QRZ Page

    I think the 806 is a drop-in (or near drop-in) replacement for the 250 TH or TL. I once read somewhere that RCA discontinued the 806 as the result of a patent dispute with Eimac. Quite a turn-around, since in the past it was nearly always the other manufacturer that was forced to defer to RCA.
  3. K5UJ

    K5UJ Ham Member QRZ Page

    You may be right. I had some idea the 806 was capable of much higher power, although a pair of them will produce 1 KW according to RCA TT-3 tube manual.
    Raytheon also made a tube similar to the 250TH. I can't recall the type number but Hallicrafters used one in the HT-4.

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