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 = 15.8
Gain(Mu) Section B = 15.8
Tester Gain (Mu) Range = 0 - 120
Tester 12AU7 Expected Gain (Mu) value = 17
Transconductance (Gm) Section A = 1603
Transconductance (Gm) Section B = 1588
Tester Gm Range 0 - 9900
Noise (dB) Section A = -85.1dB
Noise (dB) Section B = -86.0dB
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 good 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 2075