7ZH12S

Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 7.35 V / 425 mA

Description

High-frequency pentode with a short characteristic curve, designed for high-frequency voltage amplification in long-distance wire-service systems.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 7.35 V
Nominal heater current: 425 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: 0.00185 S
Max screen voltage: 180 V
Max plate dissipation: 1.9 W
Max screen dissipation: 0.4 W

Promoted fields are taken from the published electrical-characteristics and maximum-permissible-ratings tables in the approved bilingual source; repeated identical sections are represented once where applicable.

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

Plate voltage - characteristic point
20 V
Screen voltage - characteristic point
133 V
Plate current - characteristic point
5.5 mA
Screen current - characteristic point
1.05 mA
Grid-to-plate capacitance maximum
0.03 pF