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    Dieter Reeh
    CVRS Member

    we have 2 of 6K6GT tubes,
    one has 7 socket pins and was made by Sylvania
    the other has 6 socket pins and was made by Hallicrafter.
    I always thought that tube numbers were unique?
    Does somebody have some info, please.
    My 2 tube manuals only list the 7-pins type and as power pentode.

    Thank you,
    Dieter Reeh


    Les Dickson
    CVRS Member

    It looks like the tube only uses 6 pins, pin 1 and six would have no internal connections, check out the tube info at radio museum


    Don Henschel
    CVRS Member

    There also can be a variety of flavours for these old Octal tubes and a good example is the 6L6. I have them with the metal can, shoulder top envelope and also the straight sided smaller glass envelope as shown in the above posted link. Also 6L6, 6L6G, 6L6GT. The pins also vary from manufacturer and perhaps as mention no internal connection on a possible dummy pin or who knows perhaps if they have bases on hand for other model of tubes with a full set of pins would probably be used. If you want an adventure get into the European “valves” aka tubes which I now have and I believe they are referred to CT-8 bases with the bottom electrodes pointing out sideways or radial instead of axial prongs and I also have these in “eye” tubes as well.

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