(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)
$ 119.99
1 pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era with data sheets
1 tube) 3.5ma Gm=800 UX-201A
1 tube) 3.1ma Gm=700 CX-301A
Good Ma range 2-3ma
NOS Gm = 700-800
(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
See more: vacuum tube
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 (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma) "Pin It")