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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
    Forum Participant

    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.

    Dieter Reeh
    CVRS Member

    Thank you, gentlemen, Les Dickson and Don Henschel … very informative …

    … about the European tubes … before coming to Canada I had a small collection of what were called … I was told then … military tubes. They were the RV12P2000, and the whole tube actually ‘disappeared’ in the socket. 4 and 2 pins where arranged at the circular top of the holder and a single pin connected inside the holder. I think, I just found one recently again … quite unusual looking …

    that’s all for this time …

    Dieter Reeh

    John Greenland
    CVRS Member

    Hey Dieter,

    My RCA tube manual number 15 from 1947 lists a type 41 as electrically the same as a 6K6. Want to bet that a 6K6 with an octal base is no more than a repackaged 41 which had a 6 pin base?

    If octals were the standard, then why re-invent the wheel, so to speak. Re-package a 41 and give it a standardized number and base. Voila , a 6K6 !!!

    Food for thought.


    John G. VO1 CAT

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