2x Mullard ECC83 Valves Tubes Yellow-print Eq 12AX7 CV492 B339 CV4004 M8137

2x Mullard ECC83 Valves. Date Code: I61 B4A1, I61 3L2. This valve has also been tested in amplifier without any noise. NOS specification: Ia = 1.2(mA), gm = 1.6(mA/V). Ia2 = 1.23(mA), gm2 = 1.7(mA/V).

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