(!!!) (BEST PAIR #3) 47 RCA branded ARCTURUS NOS 1940's (40.5ma and 42ma)
$64.99
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1 pair) 47 RCA branded ARCTURUS NOS 1940's 1 tube) 40.5ma Gm=2750 very small section of getter flaked of glass - has no bearing on sound or performance 1 tube) 42.0ma Gm=2600 NOS Ma range 26-31ma NOS Gm range 2300-2500 (2.5 watts) (2.5V filament)
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