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Voltage Pentode - High Frequency (single) ·Pentode

6J38P

Russian miniature pentode designed for high-frequency voltage amplification. Its manufacturer description places it in RF signal-amplifier service, using compact miniature construction rather than a power-output or specialized conversion role.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B7G
Socket code
-
Base pins
7
Nominal heater
6.3 V / 190 mA

Description

Miniature pentode for high-frequency voltage amplification.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B7G
Socket code
-
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
190 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
Plate resistance
175000 Ω
Transconductance
0.0106 S
Max plate voltage
300 V
Max screen voltage
160 V
Max plate dissipation
3 W
Max screen dissipation
0.5 W
Max cathode current
20 mA

Values promoted where clearly identifiable from Russian source.

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

Pentode

Characteristic

  • Plate current

    3.5 mA

    Published Russian-source value; OCR-normalized.

  • Screen current

    1 mA

    Published Russian-source value; OCR-normalized.

  • Transconductance

    10.6 mA

    Published Russian-source value; OCR-normalized.

  • Input capacitance

    1.1

    Published Russian-source value; OCR-normalized.

  • Output capacitance

    0.9

    Published Russian-source value; OCR-normalized.

  • Transfer capacitance

    0.02

    Published Russian-source value; OCR-normalized.

  • Service life

    5000 h

    Published Russian-source value; OCR-normalized.

  • Transconductance

    6.2 µS

    Published Russian-source value; OCR-normalized.

  • Heater voltage

    6.6 V

    Nominal/published heater value.

  • Heater current

    19020 mA

    Nominal/published heater value.