8038

High-power triode designed for pulse-modulator service, with manufacturer ratings centered on short-duration high-voltage, high-current pulses rather than continuous RF or audio operation. Its intended role is switching or modulating pulsed power in professional equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 13 V / 205 A

Description

Oil-cooled high-mu pulse-switch triode for 10–20 MW hard-tube modulator service.

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: 13 V
Nominal heater current: 205 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

Amplification factor: 120
Max plate voltage: 125000 V
Max plate dissipation: 5000 W
Max grid dissipation: 1000 W
Max cathode current: 175 A

Applicable promoted ratings populated from printed headings; remaining published device-specific data retained as parameters.

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

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-Plate Capacitance
30 pF
Grid-Filament Capacitance
80 pF
Plate-Filament Capacitance
0.8 pF

Other

Filament Starting Current
800 A
Peak Plate Voltage
125000 V
Pulse
DC Grid Voltage
-1500 V
Pulse Cathode Current
175 A
Pulse
Pulse Duration
1000 us
Duty Factor
0.01