(!!!!) (Good Value Pair) CX-301-A Cunningham used/good 1930 era (2.0ma and 2.0ma)

1 pair) CX-301-A Cunningham used/good 1930 era in white boxes

1 tube) 2.0ma Gm=600 

1 tube) 2.0ma Gm=550 

Good mA range 2-3ma

NOS Gm = 700-800

Good used Gm= 500-700

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

- Crosley C5 1926

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