1x Marconi B339 Valve

Date Code: f92 B9J (1959)

Tested by AVO VCM Tester


Ia1 = 1.28(mA), gm1 = 1.65(mA/V)
Ia2 = 1.25(mA), gm2 = 1.6(mA/V)


NOS specification: Ia = 1.2(mA), gm = 1.6(mA/V)


*** This valve has also been tested in amplifier without any noise. ***



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20260803L004