CAT3

Water-cooled tungsten-filament transmitting triode for RF amplifier and oscillator service. Approximately 5 kW plate dissipation and 10 kV plate capability support substantial HF transmitter power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 19 V / 50 A

Description

Water-cooled tungsten-filament transmitting triode for RF amplifier/oscillator service to about 20 MHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 19 V
Nominal heater current: 50 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Amplification factor: 40
Max plate voltage: 10000 V
Max plate dissipation: 5000 W
Max grid dissipation: 300 W
Max cathode current: 5 A

Applicable promoted ratings mapped semantically from the printed approximate-data/ratings tables; useful non-promoted operating, capacitance and service data retained in TUBE_SECTION_PARAMETER.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Filament Voltage Range
18 to 20 V

Other

Filament Cold Resistance
0.03 ohm
Filament Starting Current Maximum
75 A
Anode Water Flow Minimum
2.5 gal/min
Frequency Maximum
20 MHz
Anode-Grid Capacitance
23.1 pF
Anode-Filament Capacitance
19.8 pF
Grid-Filament Capacitance
20.5 pF