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6P21S

Russian beam-power transmitting tube for VHF RF power amplification, producing roughly 28 W output at 80 MHz with an approximately 2,750-hour guaranteed service life.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 700 mA

Description

The 6P21S is a Russian directly heated beam tetrode for high-frequency amplification and oscillation. Its Russian source entry was translated to English and processed independently from neighboring partial entries.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 700 mA
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

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Max plate voltage: 600 V
Max screen voltage: 250 V
Max plate dissipation: 18 W
Max screen dissipation: 8.5 W
Max cathode current: 100 mA

Promoted ratings and characteristics translated from the filename-designated Russian entry only.

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

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Nominal heater voltage
6.3 V
Published source value
Nominal heater current
700 mA
Published source value
Transconductance
4000 uS
Published operating point
Guaranteed service life
2750 h
Published source value
RF output power
28 W
At 80 MHz