7J7

Receiver oscillator-converter combining local oscillation and signal mixing for superheterodyne frequency conversion. Its multi-grid structure integrates the front-end frequency-changing functions in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 7 V / 320 mA

Description

A Lock-In triode-hexode frequency converter with an oscillator triode and hexode mixer section; translated from the French source.

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: 7 V
Nominal heater current: 320 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

2 physical sections, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 1500000 Ω
Transconductance: 0.0003 S
Max plate voltage: 300 V
Max screen voltage: 100 V
Max cathode current: 14 mA

Published promoted fields populated by semantic heading; identical repeated physical sections compressed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 10400 Ω
Transconductance: 0.00135 S
Amplification factor: 14
Max plate voltage: 150 V
Max plate dissipation: 1.25 W
Max cathode current: 14 mA

Published promoted fields populated by semantic heading; identical repeated physical sections compressed.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
320 mA
Nominal
Plate Voltage
250 V
Converter
Screen Voltage
100 V
Converter

Characteristic

Conversion Conductance
310 uS
Converter

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

HexodeConversionTransconductance
300 uS
Section1
HexodePlateResistance
1500000 ohm
Section1

SECTION 2

Triode

Characteristic

TriodeTransconductance
1350 uS
Section2