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 = 44.8
Gain(Mu) Section B = 44.4
Tester Gain (Mu) Range = 0 - 120
Tester 12AY7 Expected Gain (Mu) value = 40
Transconductance (Gm) Section A = 1461
Transconductance (Gm) Section B = 1477
Tester Gm Range 0 - 9900
Noise (dB) Section A = -87.2dB
Noise (dB) Section B = -85.3dB
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 both Triode A & Triode B tested Excellent for no microphonics.
I OFFER A 100% REFUND UPON RETURN OF THE ITEM SHOULD IT NOT MEET YOUR EXPECTATIONS OR NEEDS.
LOT 1840