12J1L

Russian universal pentode designed to withstand demanding ambient conditions. Bilingual manufacturer literature provides guaranteed electrical characteristics, but the available application wording is not specific enough to assign a narrower functional family conservatively.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 12.6 V / 75 mA

Description

The 12)X1JI universal pentodes are resistant

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8G
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 75 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

Transconductance: 0.00165 S
Max plate voltage: 250 V
Max screen voltage: 225 V
Max plate dissipation: 2 W
Max screen dissipation: 0.7 W

Russian 12Zh1L (12J1L) universal short-characteristic pentode with flat base, external metal shield and indirectly heated oxide cathode, used for voltage/power amplification and RF oscillation up to 200 MHz. Nominal heater 12.6 V, 75 mA. Maximum normal plate 250 V, screen 225 V, plate dissipation 2 W and screen dissipation 0.7 W. Screen voltage 300 V allowed only at switching-on, not continuously. Transconductance about 1.65 mA/V, published guarantee 2000 h; −60 to +70°C ambient.

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

1970 Russian Tubes Mashpriborintorg

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Guaranteed service life
2000 h
PublishedGuarantee
Transconductance
165045 mA/V
PublishedElectricalCharacteristics