1U4

Directly heated miniature sharp-cutoff battery pentode designed for radio-frequency and intermediate-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 6AR
Socket code: B7G
Base pins: 7
Nominal heater: 1.4 V / 50 mA

Description

Directly heated miniature battery pentode for RF and IF amplifier 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: 6AR
Socket code: B7G
Base pins: 7
Nominal heater voltage: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6AR - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G3	A	G3 — Suppressor GridGroup 6AR1 Original EIA label G3; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN1IS	A	IS — Internal ScreenGroup 6AR1 Original EIA label IS; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN1F	—	F — FilamentGroup 6AR1 Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN2P	A	P — Plate (Anode) Original EIA label P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN3G2	A	G2 — Screen Grid Original EIA label G2; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN4IC	—	IC Original EIA label IC; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN5G3	A	G3 — Suppressor GridGroup 6AR5 Original EIA label G3; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN5IS	A	IS — Internal ScreenGroup 6AR5 Original EIA label IS; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN5F	—	F — FilamentGroup 6AR5 Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN6G1	A	G1 — Control Grid Original EIA label G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR
PIN7F	—	F — Filament Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AR

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0009 S
Max plate voltage: 110 V
Max screen voltage: 110 V
Max cathode current: 6 mA

Directly heated sharp-cutoff RF pentode for low-voltage battery receiver amplifier service.

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

Pentode

Characteristics

Input capacitance
3.6 pF
Output capacitance
7.5 pF
Grid-to-plate capacitance
0.01 pF
Plate resistance
1000000 ohm
ClassA; OperatingPoint1
Transconductance
900 uS
ClassA; OperatingPoint1

Other

Plate voltage
90 V
ClassA; OperatingPoint1
Screen voltage
90 V
ClassA; OperatingPoint1
Control-grid bias
0 V
ClassA; OperatingPoint1
Plate current
1.6 mA
ClassA; OperatingPoint1
Screen current
0.5 mA
ClassA; OperatingPoint1
Maximum plate voltage
110 V
Maximum screen voltage
110 V

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
90 V
RFIFAmplifier
Screen voltage
67.5 V
RFIFAmplifier
Plate current
2.3 mA
RFIFAmplifier
Screen current
0.7 mA
RFIFAmplifier

Characteristic

Plate resistance
1 MΩ
Section1
Transconductance
900 µS
Section1

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
90 V
ClassA;OperatingPoint1
Screen voltage
90 V
ClassA;OperatingPoint1
Plate current
1.6 mA
ClassA;OperatingPoint1
Screen current
0.5 mA
ClassA;OperatingPoint1

Characteristic

Plate resistance
1000000 ohm
ClassA;OperatingPoint1
Transconductance
900 uS
ClassA;OperatingPoint1