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Voltage Pentode - Sharp Cutoff (single) ·Pentode

1L4

Directly heated fixed-mu pentode for RF or audio-frequency voltage amplification in battery equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Directly heated fixed-mu pentode for RF or audio-frequency amplifier service in battery equipment.

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: 350000 Ω
Transconductance: 0.001025 S
Max plate voltage: 110 V
Max screen voltage: 90 V
Max plate dissipation: 0.4 W
Max screen dissipation: 0.15 W
Max cathode current: 6.5 mA

Typical characteristics vary by operating condition; representative published values promoted.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
90 V
Plate Current
4.5 mA
Screen Voltage
90 V
Screen Current
2 mA

Characteristic

Transconductance
1030 µS
Plate Resistance
350000 ohm

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
110 V
Published handbook rating
Maximum screen voltage
90 V
Published handbook rating
Plate voltage
90 V
ClassA
Screen voltage
90 V
ClassA
Control-grid voltage
0 V
ClassA
Plate current
4.5 mA
ClassA
Screen current
2 mA
ClassA

Characteristic

Plate resistance
350000 ohm
Published handbook characteristic
Transconductance
1025 µS
Published handbook characteristic
Filament voltage
1.4 V
DirectlyHeated DC filament
Filament current
50 mA
DirectlyHeated DC filament

Data set 03

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate supply
90 V
ClassA1
Screen supply
67.5 V
ClassA1
Screen current
1.2 mA
ClassA1
Plate current
2.9 mA
ClassA1

Data set 04

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
50 mA

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
90 V
ClassA1
Screen Voltage
90 V
ClassA1

Data set 06

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid-to-plate capacitance maximum
0.008 pF
Section1
Input capacitance
3.6 pF
Section1
Output capacitance
7.5 pF
Section1

Other

Plate voltage
90 V
ClassA
Screen voltage
67.5 V
ClassA
Plate current
2.9 mA
ClassA
Screen current
1.2 mA
ClassA
Plate voltage
100 V
ClassA
Screen voltage
90 V
ClassA
Plate current
4.5 mA
ClassA
Screen current
2 mA
ClassA

Characteristic

Plate resistance
0.6 MΩ
90VPlate
Transconductance
925 µS
90VPlate
Plate resistance
0.35 MΩ
100VPlate
Transconductance
1025 µS
100VPlate

Data set 07

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater or filament voltage
1.4 V
Published nominal value
Heater or filament current
50 mA
Published nominal value
Transconductance
925 µS
Published operating characteristic
Transconductance
925 µS
Published nominal value

Data set 08

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Filament voltage
1.4 V
Filament current
50 mA
Maximum plate voltage
110 V
Maximum screen voltage
90 V
Maximum total cathode current
6.5 mA
Plate voltage
90 V
ClassA
Screen voltage
67.5 V
ClassA
Grid voltage
0 V
ClassA
Plate current
2.9 mA
ClassA
Screen current
1.2 mA
ClassA

Characteristic

Plate resistance
600000 ohm
ClassA
Transconductance
925 uS
ClassA

Capacitance

Grid-to-plate capacitance
0.008 pF
Input capacitance
3.6 pF
Output capacitance
7.5 pF