Tested on AVO VCM 163 Tube tester:
Voltage Test: Va = 250V , Vg = -2V, Vf = 6.3V
Average 100% Gm = 1600 ; Ia = 1,2 mA
TEST RESULT: VERY STRONG
Valve 1:
Section 1: Gm = 2000 ; Ia = 1.60 mA
Section 2: Gm = 1800 ; Ia = 1.25 mA
Valve 2:
Section 1: Gm = 1900 ; Ia = 1.50 mA
Section 2: Gm = 1800 ; Ia = 1,25 mA
Very professional photographer, way more helpful than just a seller, he would also give you a lesson or two on how to get the best use of the lens. 10/10 would trade again!