CAT26

Water-cooled thoriated-tungsten transmitting triode for communications and industrial RF-heating amplifier or oscillator service. Very high transconductance, roughly 12 kW plate dissipation, and kilovolt operation provide substantial industrial and transmitter power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10.5 V / 57 A

Description

Water-cooled thoriated-tungsten transmitting triode for communications and RF-heating amplifier/oscillator service to 40 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: 10.5 V
Nominal heater current: 57 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: 0.095 S
Amplification factor: 45
Max plate voltage: 12000 V
Max plate dissipation: 12000 W
Max grid dissipation: 700 W
Max cathode current: 15 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
80 A
Anode Water Flow Minimum
3 gal/min
Cooling Water Outlet Temperature Maximum
65 C
Frequency Full Rating Maximum
15 MHz
Frequency Reduced Rating Maximum
40 MHz
Anode-Grid Capacitance
22 pF
Anode-Cathode Capacitance
22 pF
Grid-Cathode Capacitance
25 pF
Typical RF Output Power
26000 W
ClassC
Typical RF Output Power
16200 W
ClassC
Typical Anode-Modulated Output Power
13500 W
ClassC;AnodeModulated