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Voltage Pentode - Remote Cutoff (single) ·Pentode

6F21

Miniature variable-mu pentode for controlled HF or LF amplification, with high plate resistance and substantial voltage capability.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B7G
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 200 mA

Description

Miniature variable-mu HF pentode for HF or LF amplifiers with parallel-connected heaters.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B7G
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
200 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B7G - 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

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0025 S
Amplification factor
30
Max plate voltage
500 V
Max screen voltage
300 V
Max plate dissipation
3 W
Max screen dissipation
0.7 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

1961 AEI Industrial Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Heater Cathode Voltage

    150 V

    DC

  • Typical Anode Voltage

    250 V

  • Typical Screen Voltage

    200 V

  • TypicalAnodeCurrent

    7.8 mA

  • Typical Screen Current

    2 mA

Characteristics

  • Plate Resistance

    1.2 Mohm

Data set 02

1961 Associated Electrical Industries

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Heater Cathode Voltage

    150 V

    DC

  • Typical Anode Voltage

    250 V

  • Typical Screen Voltage

    200 V

  • TypicalAnodeCurrent

    7.8 mA

  • Typical Screen Current

    2 mA

Characteristics

  • Plate Resistance

    1.2 Mohm