14JG8

Duplex-diode high-mu triode designed primarily for FM detector and audio-frequency voltage-amplifier service. The paired diode sections perform detection while the separate-cathode triode provides comparatively strong gain for the recovered audio signal.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 9KR
Socket code: B9A
Base pins: 9
Nominal heater: 14 V / 150 mA

Description

The 14JG8 is a duplex-diode high-mu triode with separate cathodes, primarily designed for FM detector and AF voltage amplifier service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9KR
Socket code: B9A
Base pins: 9
Nominal heater voltage: 14 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9KR - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	B	K — Cathode Original chart label 2K; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN2Base Pin	C	P — Plate (Anode) Original chart label 3P; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN3Base Pin	C	K — Cathode Original chart label 3K; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN4Base Pin	—	H — Heater Original chart label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN5Base Pin	—	H — Heater Original chart label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN6Base Pin	B	P — Plate (Anode) Original chart label 2P; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN7Base Pin	A	K — Cathode Original chart label 1K; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN8Base Pin	A	G1 — Control Grid Original chart label 1G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR
PIN9Base Pin	A	P — Plate (Anode) Original chart label 1P; manufacturer confirmation pending	Unverified EIA Base Connections printed p133, 9KR

Section ratings

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 41000 Ω
Transconductance: 0.0022 S
Amplification factor: 90
Max plate voltage: 330 V
Max plate dissipation: 1.1 W

Triode section.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 5 mA

Representative row for two identical diode sections; continuous current rating is 5 mA each.

Section 3

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 5 mA

Added approved missing physical diode section row.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
250 V
AverageCharacteristics
Grid Voltage
-2 V
AverageCharacteristics

Characteristic

Plate Current
2 mA
AverageCharacteristics

SECTION 2

Diode

Characteristic

Average Diode Current Each
20 mA
5VDC