Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode ·Triode

GU21B

Forced-air-cooled Russian high-power RF transmitting triode.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
8.05 V / -

Description

Forced-air-cooled high-power RF triode.

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
8.05 V
Nominal heater current
-
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
9000 V
Max plate dissipation
1000 W
Max grid dissipation
600 W

English text primary; Russian used only as secondary cross-check.

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

1968 Electronintorg

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Operating Frequency

    26 MHz

  • Maximum Anode Voltage

    9000 V

  • Maximum Anode Dissipation

    1000 W

  • Maximum Grid Dissipation

    600 W

  • Filament Starting Current

    225 A

Characteristic

  • Heater/Filament Voltage

    8.05 V