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

1U5

Directly heated diode and sharp-cutoff pentode combination for detector and amplifier service in battery radios. The diode performs signal detection while the pentode provides subsequent gain with low filament consumption.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Directly heated diode-pentode for detection, AVC, and AF amplification in 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: 6BW
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

6BW - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11G3	A	G3 — Suppressor GridGroup 6BW1 Source code 1G3; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN1F	—	F — FilamentGroup 6BW1 Source code F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN21P	A	P — Plate (Anode) Source code 1P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN31G2	A	G2 — Screen Grid Source code 1G2; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN42P	B	P — Plate (Anode) Source code 2P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN61G1	A	G1 — Control Grid Source code 1G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW
PIN7F	—	F — Filament Source code F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 6BW

Section ratings

2 physical sections, each with unique specifications.

Section 1

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

Directly heated diode and sharp-cutoff pentode for detector and amplifier service.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 0.25 mA

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

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
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 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

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
Maximum plate voltage
90 V
Maximum screen voltage
90 V

Characteristics

Plate resistance
600000 ohm
ClassA; OperatingPoint1
Transconductance
625 uS
ClassA; OperatingPoint1

Data set 03

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
AudioAmplifier
Screen voltage
67.5 V
AudioAmplifier
Plate current
1 mA
AudioAmplifier
Application
AF amplifier
Section1

Characteristic

Plate resistance
0.6 MΩ
Section1

SECTION 2

Diode

Other

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

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical Plate Voltage
67.5 V
ClassA
Typical Screen Voltage
67.5 V
ClassA
Typical Plate Current
1.6 mA
ClassA
Typical Screen Current
0.4 mA
ClassA

SECTION 2

Diode

Characteristic

Average Diode Current at 10 V DC Applied
1.5 mA