2x NOS Mullard ECC81 Valves Tubes 1953 []-get Eq 12AT7 B309 CV4024 A2900 M8162

2x Mullard ECC81 Valves. Date Code: 1552 G3 (1953), 1552 F3 (1953). NOS specification: Ia = 10.5(mA), gm = 5.5(mA/V). This valve has also been tested in amplifier without any noise. Ia1 = 10.8(mA), gm1 = 5.3(mA/V).

eBay