(!!!!) (Best Overall Pair) 01A Cunningham NOS 1940 era boxes were factory sealed (3.7ma and 3.6ma) (Same Gm)

1 pair) 01A Cunningham NOS 1940 era boxes were factory sealed – gold colored printing

1 tube) 3.7ma and Gm=800

1 tube) 3.6ma and Gm=800

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