RAYTHEON CK5751 (LOWER GAIN 12AX7) BLACK PLATE WINDMILL GETTER GAIN (76.9, 77.2)
TESTED ON A MAXI PREAMP II TUBE TESTER FOR GAIN(Mu), TRANSCONDUCTANCE(Gm) AND NOISE(dB). While performing an audio tap test on the Maxi Preamp through a guitar amp Triode A tested good when tapped, Triode B tested good when tapped.