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Thread: Are these equivalent to anything you know of?

  1. #1
    Junior Member
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    Mar 2008
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    Utah
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    Are these equivalent to anything you know of?

    Wondering what the differences are between them and the 12at7 or 5751--
    I can see some initial differences... like the filament current is rated at double the 12at7...

    Any help?

    GU17

    Type
    double beam tetrode

    Cathode type
    oxide,indirect heating

    Application field
    oscillation and power amplification up to 250MHz

    Brief application

    Amplification, oscillation

    Envelope
    miniature glass

    Cooling method
    air

    Dimensions
    80mmx22.5mm

    Mass
    25 g

    Filament voltage
    6.3 V

    Filament current
    0.72 - 0.88 A

    normal anode voltage
    200V

    Mutual conductance
    1.6 to 3.3 mA/V

    Output power
    12 W

    Maximum anode voltage
    400V

    Maximum operating frequency
    250MHz

  2. #2
    Member Le Basseur's Avatar
    Join Date
    Jun 2006
    Location
    Croatia
    Posts
    99
    Possible substitutions (not verified,though):
    GU17=6360= RS1023 = QQE03/12 = CV2798 = RS1029
    Data here:
    www.radiotechnika.hu/images/GU17.pdf
    Interesting tube...I have it in my collection but I never cared too much as to put it at work.Looks like a newer "kid in town" from the long list of the (bigger) GU bros but I missed the 17's original intended use.
    Regards,

  3. #3
    Senior Member
    Join Date
    Apr 2008
    Posts
    255
    That is definitely nothing like the 12at7 or 5751. That looks like a power tube, not a preamp tube. I think the russian 12??7 equivalents are like 6n?p or something, there are substitution guides on the internet somewhere. The 12at7 triode sections were used in *tons* of other NOS tubes, so there are many tubes that contain for instance 1/2 6cg7 and 1/2 12at7, or 1/2 12at7 and a power pentode (6bm8). 6gn8 is like a super 12ax7 (half plate resistance, same gain) combined with a small signal pentode that could be used as a preamp or CCS. 12AZ7 is essentially the same as a 12at7, albeit with higher cathode-heater insulation.
    Cheers.

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