1U4WA

Ruggedized directly heated sharp-cutoff pentode for RF and AF voltage amplification in portable military or professional equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 6AR
Socket code: B7G
Base pins: 7
Nominal heater: 1.25 V / 50 mA

Description

Ruggedized filament-type sharp-cutoff pentode for RF and AF amplification in portable 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: 1.25 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

Transconductance: 0.0009 S
Max plate voltage: 90 V
Max screen voltage: 90 V
Max plate dissipation: 0.17 W
Max screen dissipation: 0.05 W
Max cathode current: 3 mA

Published maximum ratings and characteristics promoted from approved source.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
1.25 V
Nominal
HeaterCurrentNominal
50 mA
Nominal
Maximum Plate Voltage
90 V
Maximum Screen Voltage
90 V
Maximum Plate Dissipation
0.17 W
Maximum Cathode Current
2.5 mA

Characteristic

Transconductance
900 µS
Typical

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

MaximumImpactAcceleration
450 G
ShockTest
MaximumVibrationalAcceleration
2.5 G
96HourFatigueTest

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum impact acceleration
450 G
Ruggedized
Maximum vibrational acceleration
2.5 G
Ruggedized
Nominal filament voltage
1.25 V
Filament current
50 mA
Plate voltage
90 V
Typical
Grid #2 voltage
90 V
Typical
Plate current
1.6 mA
Typical

Characteristic

Transconductance
900 uS