UX-201-A Radiotron used/good 1930 era (2.4ma Gm=550)

UX-201-A Radiotron Balloon used/good 1930 era brass pins

2.4ma

Gm=550

Good Ma range 2-3ma

NOS Gm = 800

(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