1J18B

Directly heated subminiature Russian pentode for high- and intermediate-frequency voltage amplification. It is a compact RF/IF signal tube intended for miniature equipment rather than power-output service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.2 V / 23.5 mA

Description

Directly heated subminiature pentode for high- and intermediate-frequency voltage amplification.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 1.2 V
Nominal heater current: 23.5 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

Pentode

X-ray radiationInterelectrode capacitances

Max plate voltage: 90 V
Max screen voltage: 60 V
Max cathode current: 2.5 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
0.5 mA
Published Russian-source value; OCR-normalized.
Screen current
0.25 mA
Published Russian-source value; OCR-normalized.
Transconductance
0.45 µS
Published Russian-source value; OCR-normalized.
Input capacitance
0.9 pF
Published Russian-source value; OCR-normalized.
Output capacitance
0.4 pF
Published Russian-source value; OCR-normalized.
Transfer capacitance
0.01 pF
Published Russian-source value; OCR-normalized.
Service life
3000 h
Published Russian-source value; OCR-normalized.
Transconductance
0.55 µS
Published Russian-source value; OCR-normalized.
Plate current
45 mA
Published Russian-source value; OCR-normalized.
Screen current
1 mA
Published Russian-source value; OCR-normalized.
Transconductance
0.3 µS
Published Russian-source value; OCR-normalized.
Input capacitance
0.4 pF
Published Russian-source value; OCR-normalized.
Output capacitance
0.45 pF
Published Russian-source value; OCR-normalized.
Transfer capacitance
0.008 pF
Published Russian-source value; OCR-normalized.
Service life
25000 h
Published Russian-source value; OCR-normalized.
Heater current
2.5 mA
Nominal/published heater value.