Power - Triode ·Triode
Transmitting power triode intended for RF amplifier and oscillator operation. Its published service data center on radio-frequency power generation and the plate loading expected of an industrial transmitting tube.
Cathode-tapped V4 version of the 20B triode. The supplied Emission Labs sheet was read for filament data, maximum ratings, representative operating points, gm/rp/mu, output conditions, capacitances, and rectifier filter conditions as applicable.
International Octal
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Filament voltage
5 V
Filament current
1.4 A
Factory test plate voltage
420 V
Factory test plate current
42 mA
Factory test grid voltage
-9.9 V
Plate resistance
3000 ohm
Amplification factor
21
Transconductance
6900 uS
Cathode-tapped filament
2.5-0-2.5 V