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 = 16.0
Gain(Mu) Section B = 14.6
Tester Gain (Mu) Range = 0 - 120
Tester 12AU7 Expected Gain (Mu) value = 17
Transconductance (Gm) Section A = 1218
Transconductance (Gm) Section B = 1038
Tester Gm Range 0 - 9900
Noise (dB) Section A = -86.0dB
Noise (dB) Section B = -84.8dB
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 had some mechanical noise when tapped.
I OFFER A 100% REFUND UPON RETURN OF THE ITEM SHOULD IT NOT MEET YOUR EXPECTATIONS OR NEEDS.
LOT 2004