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Heptode ·Heptode

6A4P

Russian high-transconductance converting heptode intended for pulse-operated stationary equipment, combining signal conversion with unusually high transconductance and substantial plate ratings.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 485 mA

Description

The 6A4P is an indirectly heated high-transconductance converting heptode for pulse-operated stationary equipment.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
485 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

Heptode

X-ray radiationInterelectrode capacitances
Transconductance
0.016 S
Max plate voltage
250 V
Max screen voltage
150 V
Max plate dissipation
2 W
Max screen dissipation
0.5 W
Max cathode current
20 mA

Representative section row from the complete filename-matched Russian datasheet content only; neighboring-tube fragments excluded.

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

195X Russian

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

  • Anode voltage

    200 V

    Published operating point

  • Grid 2 and grid 4 voltage

    100 V

    Published operating point

  • Grid 1 voltage

    -10 V

    Published operating point

  • Grid 1 pulse voltage

    10 V

    Pulse

  • Anode pulse current

    34 mA

    Published value

  • Grid 2 pulse current

    26 mA

    Published value

  • Grid 4 pulse current

    32 mA

    Published value

  • Grid 1 transconductance

    16 mA/V

    At grid 1 -11 V

  • Grid 3 transconductance

    5.5 mA/V

    At grid 3 -3 V

  • Grid 1 inverse current

    0.5 uA

    Published condition

Data set 02

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

  • Heater voltage nominal

    6.3 V

    Published heater operating voltage

  • Heater current nominal

    485 mA

    Nominal or midpoint of published heater-current tolerance

  • Heater current minimum

    440 mA

    Heater 6.3 V

  • Heater current maximum

    530 mA

    Heater 6.3 V

  • Pulse plate current

    34 mA

    Published pulse operating point

  • Grid 1 transconductance

    16 mA/V

    Grid 1 at -11 V

  • Grid 3 transconductance

    5.5 mA/V

    Grid 3 at -3 V

Capacitance

  • Input capacitance grid 1

    10.5 pF

    Published nominal

  • Input capacitance grid 3

    11.5 pF

    Published nominal

  • Output capacitance

    2.8 pF

    Per plate

  • Plate-to-grid 1 capacitance

    0.08 pF

    Maximum

  • Plate-to-grid 3 capacitance

    0.35 pF

    Published

  • Plate-to-plate capacitance

    0.26 pF

    Maximum

Other

  • Heater voltage minimum

    5.7 V

    Operating limit

  • Heater voltage maximum

    7 V

    Operating limit