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 = 94.6
Gain(Mu) Section B = 94.0
Tester Gain (Mu) Range = 0 - 120
Tester 12AX7 Expected Gain (Mu) value = 92
Transconductance (Gm) Section A = 1777
Transconductance (Gm) Section B = 1615
Tester Gm Range 0 - 9900
12AX7 tubes have a center design target of 1600Gm
Noise (dB) Section A = -87.2dB
Noise (dB) Section B = -86.6dB
Tester Noise (dB) Range -92dB - 0dB
TEST RESULTS ARE SHOWN IN PHOTOGRAPHS.
While performing an audio tap test on the Maxi Preamp through a guitar amp Triode A tested excellent when tapped, Triode B tested good when tapped.
I OFFER A 100% REFUND UPON RETURN OF THE ITEM SHOULD IT NOT MEET YOUR EXPECTATIONS OR NEEDS.
LOT 2115