Power - Tetrode (NOT beam) ·Tetrode
Western Electric thoriated-tungsten transmitting tetrode rated for Class-B RF service with approximately 12.5 W catalog output. Designed for radio-frequency power amplification.
Western Electric transmitting tetrode with a thoriated-tungsten filament, rated for B-RF service and a catalog power output of 12.5 W.
Medium 4-contact bayonet base
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
Average characteristics at Eb=750 V, Ib=33 mA, screen=150 V. Screen voltage is operating data, not a promoted maximum.
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.
Plate-filament capacitance
5.4 pF
Published direct interelectrode capacitance
Grid-filament capacitance
11.2 pF
Published direct interelectrode capacitance
Data set 02
Published operating points and test conditions from this source.
Filament Voltage
7.5 V
Filament Current
3.25 A
Maximum Plate Voltage
750 V
Maximum Plate Current
75 mA
Maximum Plate Dissipation
25 W
Maximum Frequency
15 MHz
Plate Voltage
750 V
B-RF
Plate Current
33 mA
B-RF
Power Output
12.5 W
B-RF
Amplification Factor
100
B-RF
Transconductance
1160 µS
B-RF
Data set 03
Published operating points and test conditions from this source.
PlateToControlGridCapacitance
0.085 pF
PlateToFilamentAndScreenCapacitance
5.4 pF
ControlGridToFilamentAndScreenCapacitance
11.2 pF
Screen Grid Voltage
150 V
Maximum Frequency
15 MHz
FullRatings
NominalPowerOutput
37.5 W
ClassC;PlateVoltage=750V