2x Mullard ECC83 Valves Tubes f92 Long Plate Eq 12AX7 CV492 B339 CV4004 M8137

Date Code: f92 B8L, f92 B8K. 2x Mullard ECC83 Valves. This valve has also been tested in amplifier without any noise. Ia1 = 1.15(mA), gm1 = 1.4(mA/V). NOS specification: Ia = 1.2(mA), gm = 1.6(mA/V).

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