-40%
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s
1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s

1 x 12au7 Raytheon Tube*Black Plate - D Getter*Lower/Uneven Testing*(8 Avail)50s

$ 5.27

Availability: 31 in stock
  • Refund will be given as: Money Back
  • Item must be returned within: 14 Days
  • Return shipping will be paid by: Buyer
  • Restocking Fee: 20%
  • All returns accepted: Returns Accepted
  • Brand: Raytheon

    Description

    1 x 12au7 Raytheon Tube
    Made in USA
    Shiny Black Plates
    D or square getter
    The lettering is pretty good
    1950 codes
    Tested on enhanced Triplett E3444 by Paul Hart of Ga.
    See pictures for results and pick the one(s) you want
    Bogey(100%) = 2200/2200 micromhos(gm) @ 10.0/10.0 mA +/- 10%
    The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers.  This tester applies test conditions for this tube as shown below (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable.  A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us.
    The test conditions for this listing are
    __
    250
    _Volts plate, __
    250
    _Volts screen, ___
    -8.5
    ___Volts bias or Cathode resistance
    *
    What were your tubes tested at?
    Price is for 1 (one) tube and there are several available
    I do combine S&H
    S&H to China,Italy and a few other countries will require a Tracking # and will cost a minimum of ,depending on weight.