7820

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: 7 V / 110 A

Description

Forced-air-cooled power triode optimized for Class-AB audio 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: 7 V
Nominal heater current: 110 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: 6
Max plate voltage: 8000 V
Max plate dissipation: 4300 W

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 Voltage
7 V
Filament Current
110 A
Amplification Factor
6

Capacitance

Grid-Plate Capacitance
52 pF
Grid-Filament Capacitance
43 pF
Plate-Filament Capacitance
12 pF

Other

Maximum Plate Voltage
8000 V
Maximum Plate Dissipation
4300 W
Maximum Signal DC Plate Current
5 A
ClassAB audio