(!!!!) (Best Pair) 201A Silvertone Balloon NOS and like new 1930 era (4.2ma and 5.0ma) (Highest mA and Gm)

1 pair) 201A Silvertone Balloon NOS and like new 1930 era

1 tube) 5.0ma and Gm=900 Silvertone box

1 tube) 4.2ma and Gm=800 white box

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