Amperex 6dj8 Ecc88 Bugle Boy Pair W/ Halo Tube Tubes Tested Nice Lettering

US $330

  • Minneapolis, Minnesota, United States
  • Nov 9th
1966 Amperex tubes with identical date codes!  Both are delta6K4 from the Heerlen, Netherlands/Holland plant! Tested on my Maxi-Preamp Tester.  This tester is made for digitally testing only preamp vacuum tubes. Results:        Tube 1              A              B RMS Noise (dB)   -81.3        -81.3 Gm (umho)           4330        4200 GAIN (mu)             30.8         29.1                Tube 2              A              B RMS Noise (dB)   -81.3        -81.1 Gm (umho)           4014        4136 GAIN (mu)             31.2         32.5

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