(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)
$119.99
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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:-----------------Plate Voltage = 90 VGrid No. 1 Voltage -4.5VAmplification Factor (mu) = 8Plate Resistance (approx) 11KohmsTransconductance = 725mhosPlate Current = 2.5 mA
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