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Voltage Pentode or Tetrode (under 100V) ·Diode-Pentode

1S5

Directly heated diode-pentode combining radio detection with audio-frequency voltage amplification in battery receivers. The diode recovers the signal while the sharp-cutoff pentode supplies subsequent audio gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 6AU
Socket code: B7G
Base pins: 7
Nominal heater: 1.4 V / 50 mA

Description

Directly heated diode-pentode combining a detector diode with an audio-frequency preamplifier pentode for battery receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6AU
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

6AU - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11G3	A	G3 — Suppressor GridGroup 6AU1 Original EIA label 1G3; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN1F	—	F — FilamentGroup 6AU1 Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN32P	B	P — Plate (Anode) Original EIA label 2P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN41G2	A	G2 — Screen Grid Original EIA label 1G2; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN51P	A	P — Plate (Anode) Original EIA label 1P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN61G1	A	G1 — Control Grid Original EIA label 1G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN7F	—	F — Filament Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 0.25 mA

Diode section; source publishes limited separate diode ratings/characteristics.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 600000 Ω
Transconductance: 0.000625 S
Max plate voltage: 90 V
Max screen voltage: 90 V
Max cathode current: 3 mA

Detector diode and sharp-cutoff pentode for battery receiver signal amplification.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
50 mA

SECTION 2

Pentode

Other

Voltage Gain
50
SupplyVoltage=90V

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 2

Pentode

Other

Plate Voltage
67.5 V
PentodeSection
Plate Current
1.6 mA
PentodeSection
Screen Voltage
67.5 V
PentodeSection
Screen Current
0.4 mA
PentodeSection

Characteristic

Transconductance
625 µS
PentodeSection
Plate Resistance
600000 ohm
PentodeSection

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Pentode

Other

Plate voltage
67.5 V
ClassA; OperatingPoint1
Screen voltage
67.5 V
ClassA; OperatingPoint1
Control-grid bias
0 V
ClassA; OperatingPoint1
Plate current
1.6 mA
ClassA; OperatingPoint1
Screen current
0.4 mA
ClassA; OperatingPoint1

Data set 04

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
50 mA

Data set 05

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Application
Detector and AVC diode
Section2
Peak inverse voltage maximum
90 V
DetectorDiode
Average diode current maximum
0.2 mA
DetectorDiode

SECTION 2

Pentode

Other

Plate voltage
90 V
AudioAmplifier
Screen voltage
67.5 V
AudioAmplifier
Plate current
0.3 mA
AudioAmplifier
Screen current
0.1 mA
AudioAmplifier
Application
Resistance-coupled AF amplifier
Section1

Characteristic

Plate resistance
2 MΩ
Section1

Data set 06

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

Average diode current at 10 V DC
1.5 mA

SECTION 2

Pentode

Other

Plate voltage
67.5 V
ClassA
Screen voltage
67.5 V
ClassA
Plate current
1.6 mA
ClassA
Screen current
0.4 mA
ClassA

Characteristic

Plate resistance
600000 ohm
ClassA
Transconductance
625 uS
ClassA

Data set 07

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater or filament voltage
1.4 V
Published nominal value
Heater or filament current
50 mA
Published nominal value
Transconductance
625 µS
Pentode section

SECTION 2

Pentode

Characteristics

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