1H34

Low-power directly heated heptode frequency changer for portable battery receivers. Its economical filament supports oscillator-mixer service from modest plate and screen supplies in compact superheterodyne radios.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 1.2 V / 30 mA

Description

Directly heated variable-mu heptode for mixer and frequency-converter service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: 7
Nominal heater voltage: 1.2 V
Nominal heater current: 30 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

Heptode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0003 S
Max plate voltage: 90 V
Max screen voltage: 67.5 V
Max plate dissipation: 0.15 W
Max screen dissipation: 0.25 W
Max cathode current: 5.5 mA

Published ratings and characteristics promoted from the source where directly stated.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

Heater or filament voltage
1.2 V
Published nominal value
Heater or filament current
30 mA
Published nominal value
Screen-grid voltage
67.5 V
Published characteristic value

Capacitance

Input capacitance g1
3.8 pF
Published interelectrode capacitance

Data set 02

1969 Tesla Manual of Electronic Tubes

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

Application
MixerFrequencyConverter text