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TESTED ON A MAXI PREAMP II TUBE TESTER FOR GAIN(Mu), TRANSCONDUCTANCE(Gm) AND NOISE(dB). THE MAXI PREAMP II TESTS TUBES AT 200 VDC PLATE CURRENT 4 TIMES PER SECOND.
Gain(Mu) Section A = 101.2
Gain(Mu) Section B = 102.7
Tester Gain (Mu) Range = 0 - 120
Tester 12AX7 Expected Gain (Mu) value = 92
Transconductance (Gm) Section A = 1833
Transconductance (Gm) Section B = 1804
Tester Gm Range 0 - 9900
Noise (dB) Section A = -82.5dB
Noise (dB) Section B = -82.5dB
Tester Noise (dB) Range -92dB - 0dB
While performing an audio tap test on the Maxi Preamp played through a guitar amplifier triode A exhibited a little bit microphonic, triode B tested good for microphonics.
TEST RESULTS ARE SHOWN IN PHOTOGRAPHS.
I OFFER A 100% REFUND UPON RETURN OF THE ITEM SHOULD IT NOT MEET YOUR EXPECTATIONS OR NEEDS.
LOT 1300