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  • #25790
    Les Dickson
    CVRS Member

    I’m looking for a Triode 86 or 86S vacuum tube that tests good. I have a few tube checkers and none of them have the capability of testing an 86.
    Base UY-Base, 5 Pins

    #25791
    John Greenland
    CVRS Member

    Hi Les,

    Happy New Year,

    I am sure that you are aware that this tube is listed as rare.

    A couple of things to try. I can not guarantee either and you are on your own, as I have no way to test this but from all the info I could find ——

    idea # 1; try a 37 or a 76 in your radio. If it is a model 1721 that you are looking at, the 86 tube is only an audio driver.

    idea #2 Alternatively If you have an 86 try testing it as a 37 or 76. They are both triodes and according to what I can find have the same basing layout and heater voltage. You can make sure the heaters are on the same two pins before you start . It would not hurt to check the heater connections.

    #25792
    Les Dickson
    CVRS Member

    Hi John, Happy New Year to you as well.
    I am indeed working on a 1721 DeForest. I have the radio working, but given that the 86 is rare I thought I’d look for a spare. I’m fixing it for someone else and it seems to have a lot of sentimental value so I figured it might be easier to find one now rather than in the future if it dies again. I’ll check into the 37 and 76 options.
    Thanks for the info.

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