7D21

Forced-air-cooled high-power transmitting tetrode designed for Class-C RF amplifier and oscillator service. Its construction supports substantial professional radio-frequency output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 24 A

Description

Forced-air-cooled high-power transmitting tetrode for Class-C RF amplifier and oscillator 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: 6.3 V
Nominal heater current: 24 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

Tetrode

X-ray radiationInterelectrode capacitances

Amplification factor: 8
Max plate voltage: 4000 V
Max plate dissipation: 1200 W

Published source values promoted where applicable; additional published values 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

1950 General Electric Transmitting Types

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Maximum full-rating frequency
110 MHz
Plate power output approximate
1575 W
ClassC

Construction

Cooling method
Forced air