6J40P

Russian pentode for both high- and low-frequency voltage amplification using a low-voltage anode and screen supply. Its broad signal-amplifier role is distinguished by operation from comparatively low supply voltages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: B7G
Socket code: -
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Pentode for high- and low-frequency voltage amplification with low-voltage anode-screen supply.

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: 300 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: 100000 Ω
Transconductance: 0.0021 S
Max plate voltage: 30 V
Max screen voltage: 30 V
Max plate dissipation: 0.5 W
Max screen dissipation: 0.5 W
Max cathode current: 15 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
1.85 mA
Published Russian-source value; OCR-normalized.
Screen current
0.55 mA
Published Russian-source value; OCR-normalized.
Transconductance
2 µS
Published Russian-source value; OCR-normalized.
Plate resistance
200 kΩ
Published Russian-source value; OCR-normalized.
Amplification factor
4.3
Published Russian-source value; OCR-normalized.
Input capacitance
6.7
Published Russian-source value; OCR-normalized.
Output capacitance
4
Published Russian-source value; OCR-normalized.
Transfer capacitance
0.015
Published Russian-source value; OCR-normalized.
Service life
1500 h
Published Russian-source value; OCR-normalized.
Transconductance
1.4 µS
Published Russian-source value; OCR-normalized.
Heater voltage
75 V
Nominal/published heater value.
Heater current
300 mA
Nominal/published heater value.