(!!!!) (Best Pair #2) 01A RCA Cunningham engraved base NOS 1930”s (3.3ma and 3.2ma) (same Gm)

1 pair) 01A RCA Cunningham engraved base NOS 1930”s

1 tube) 3.3ma and Gm=800

1 tube) 3.2ma and Gm=800 slightly taller glass

NOS Ma = 2.5-3ma+

NOS Gm = 700-900

(Filament=5V @ 250ma, Vplate max=135V)

– Crosley C5 1926

Class A Amplifier:
—————–
Plate Voltage = 90
VGrid No. 1 Voltage -4.5V
Amplification Factor (mu) = 8
Plate Resistance (approx) 11Kohms
Transconductance = 725mhos
Plate Current = 2.5 mA