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Voltage - Triode (single high frequency) ·Triode

6J4

High-transconductance triode for grounded-grid UHF amplification up to approximately 500 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7BQ
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 400 mA

Description

The 6J4 is a miniature triode designed primarily as a grounded-grid UHF amplifier, combining a mu of about 55 with very high transconductance for operation to roughly 500 MHz.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BQ
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 400 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7BQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA source label G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN2K	A	K — Cathode EIA source label K; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN3H	—	H — Heater EIA source label H; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN4H	—	H — Heater EIA source label H; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN5G1	A	G1 — Control Grid EIA source label G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN6G1	A	G1 — Control Grid EIA source label G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ
PIN7P	A	P — Plate (Anode) EIA source label P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BQ

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 4500 Ω
Transconductance: 0.012 S
Amplification factor: 55
Max plate voltage: 150 V
Max screen voltage: 800 V
Max plate dissipation: 2.75 W
Max cathode current: 40 mA

High-frequency grounded-grid triode.

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 General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
150 V
Published handbook rating
Plate voltage
150 V
ClassA
Plate current
15 mA
ClassA

Characteristic

Plate resistance
4500 ohm
Published handbook characteristic
Transconductance
12000 µS
Published handbook characteristic
Amplification factor
55
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
400 mA
Published heater rating

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Cathode resistor
100 Ω
UHFAmplifier
Plate voltage
100 V
UHFAmplifier
Plate current
10 mA
UHFAmplifier

Characteristic

Plate resistance
5000 Ω
Section1
Transconductance
11000 µS
Section1
Amplification factor
55
Section1

Data set 03

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Application
UHF cathode-drive amplifier

Other

Maximum useful frequency
500 MHz

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
150 V
Published operating/characteristic table

Characteristic

Plate Current
15 mA
Published operating/characteristic table
Transconductance
12000 uS
Published operating/characteristic table
Amplification Factor
55
Published operating/characteristic table

Data set 05

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
ClassA1;GroundedGrid
Plate current
15 mA
ClassA1;GroundedGrid
Cathode resistor
100 ohm
ClassA1;GroundedGrid
Maximum heater-cathode voltage
90 V
WholeTube

Characteristic

Maximum operating frequency
500 MHz
GroundedGridUHF

Data set 06

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Heater current
400 mA
Peak heater-cathode voltage
90 V
Plate voltage
150 V
ClassA
Cathode current
20 mA
GroundedGrid
Maximum operating frequency
500 MHz
UHF

Characteristic

Transconductance
12000 uS
GroundedGrid
Amplification factor
60

Capacitance

Cathode-to-plate capacitance
0.24 pF
Grid-to-cathode capacitance
5.5 pF
Grid-to-plate capacitance
4 pF

Data set 07

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate current
10.8 mA
Published Russian-source value; OCR-normalized.
Transconductance
5.2 µS
Published Russian-source value; OCR-normalized.
Input capacitance
6
Published Russian-source value; OCR-normalized.
Transfer capacitance
0.0035
Published Russian-source value; OCR-normalized.
Service life
25000 h
Published Russian-source value; OCR-normalized.
Transconductance
3.8 µS
Published Russian-source value; OCR-normalized.
Heater voltage
6.9 V
Nominal/published heater value.
Heater current
300 mA
Nominal/published heater value.

Data set 08

198X Shuguang

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
6.3 V
Nominal
Heater current
300 mA
Nominal
Plate voltage
250 V
Published principal electrical parameter