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F1091

Experimental very-high-power directly heated triode developed for hard-tube modulator service and demonstrated at more than 50 MW peak output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 31 V / 975 A

Description

The ITT F1091 is a very-high-power directly heated triode developed for hard-tube modulator service and demonstrated at more than 50 MW peak output.

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: 31 V
Nominal heater current: 975 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

Max plate voltage: 65000 V
Max cathode current: 1340 A

Source is a technical news/test sheet rather than a full production datasheet; published test conditions are preserved. ITT F1091 experimental directly heated high-power modulator triode using a thoriated-tungsten mesh cathode. Documented tests at 65 kV / 900 A peak and 55 kV / 1340 A peak gave approximately 50.4 MW and 52 MW output pulses respectively. These currents and voltages are pulse test conditions, not unrestricted continuous cathode or anode limits. ITT also reported 390 kW plate dissipation and more than 90 MW peak pulse output in a separate 1968 announcement.

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

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Filament power
30 kW

Other

Peak power output condition 1
50.4 MW
Condition1
Peak power output condition 2
52 MW
Condition2
Plate supply voltage
65 kV
Condition1
Plate supply voltage
55 kV
Condition2
Output pulse voltage
56 kV
Condition1
Output pulse voltage
38.8 kV
Condition2
Peak plate current
900 A
Condition1
Peak plate current
1340 A
Condition2
Peak positive grid voltage
1400 V
Condition1
Peak positive grid voltage
1800 V
Condition2
Peak grid current
170 A
Condition1
Peak grid current
200 A
Condition2
Load resistance
62 ohm
Condition1
Load resistance
29 ohm
Condition2
Pulse duration
1000 us
Duty factor
0.01