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 = 43.0
Gain(Mu) Section B = 42.4
Tester Gain (Mu) Range = 0 - 120
Tester 12AY7 Expected Gain (Mu) value = 40
Transconductance (Gm) Section A = 1130
Transconductance (Gm) Section B = 1158
Tester Gm Range 0 - 9900
Noise (dB) Section A = -84.2dB
Noise (dB) Section B = -83.3dB
Tester Noise (dB) Range -92dB - 0dB
While performing an audio tap test on the Maxi Preamp played through a guitar amplifier triode A tested good and triode B also tested good when tapped.
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 1910