6C21

Power triode intended for radio-frequency amplifier and oscillator service. Manufacturer documentation emphasizes RF power operation and transmitting applications rather than ordinary receiving-tube voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: J4
Base pins: 4
Nominal heater: 8.2 V / 17 A

Description

High-vacuum pulse power triode for pulse-modulator service; forced-air and radiation cooled.

Socket description

Jumbo 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: J4
Base pins: 4
Nominal heater voltage: 8.2 V
Nominal heater current: 17 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: 30
Max plate voltage: 35000 V
Max plate dissipation: 300 W
Max grid dissipation: 50 W

Promoted fields populated from published ratings/characteristics; additional published values 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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-Plate Capacitance
4.3 pF
Input Capacitance
9.5 pF
Output Capacitance
0.7 pF

Other

Peak Positive Plate Voltage Maximum
35 kV
Pulse
Peak Plate Current Maximum
15 A
Pulse
Peak Positive Grid Voltage Maximum
1.6 kV
Pulse
Typical DC Plate Voltage
28 kV
PulseModulator
Typical Pulse Plate Current
15 A
PulseModulator
Typical Pulse Power Output
375 kW
PulseModulator
Duty Factor
0.002
PulseModulator