CAT27

Very-high-power water-cooled thoriated-tungsten transmitting triode for communications and RF-heating power amplifiers. Approximately 150 kW plate dissipation and 20 kV capability support enormous continuous industrial and transmitter RF power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 17.5 V / 285 A

Description

Water-cooled thoriated-tungsten transmitting triode for communications and RF-heating power-amplifier service to 26 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: 17.5 V
Nominal heater current: 285 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: 0.05 S
Amplification factor: 45
Max plate voltage: 20000 V
Max plate dissipation: 150000 W
Max grid dissipation: 8000 W
Max cathode current: 120 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

Other

Filament Starting Current Maximum
375 A
Anode Water Flow Minimum
20 gal/min
Cooling Water Outlet Temperature Maximum
65 C
Frequency Full Rating Maximum
15 MHz
Frequency Reduced Rating Maximum
26 MHz
Anode-Grid Capacitance
13 pF
Anode-Cathode Capacitance
36 pF
Grid-Cathode Capacitance
101 pF
Typical RF Output Power
92000 W
ClassC
Typical RF Output Power
138000 W
ClassC
Typical Plate Voltage
14000 V
AnodeModulated