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

1V6

Directly heated subminiature triode-pentode for low-power battery-operated amplifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7BC
Socket code: B7G
Base pins: 7
Nominal heater: 1.25 V / 40 mA

Description

Directly heated subminiature triode-pentode for low-power battery-operated amplifier circuits.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BC
Socket code: B7G
Base pins: 7
Nominal heater voltage: 1.25 V
Nominal heater current: 40 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7BC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1F	—	F — Filament EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN32G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN4FCT	—	FCT — Filament Center Tap EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN51G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN61P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC
PIN7F	—	F — Filament EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BC

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 12000 Ω
Transconductance: 0.0002 S
Amplification factor: 2.4
Max plate voltage: 45 V

Oscillator triode section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0002 S
Max plate voltage: 90 V
Max screen voltage: 90 V

Directly heated triode-pentode converter combining oscillator and mixer functions.

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

Triode

Other

Oscillator-grid current
12 uA
Converter
Oscillator-grid resistor
1000000 ohm
Converter
Oscillator plate voltage
45 V
Converter
Oscillator plate current
1.4 mA
Converter

SECTION 2

Pentode

Other

Plate voltage
45 V
ClassA; OperatingPoint1
Screen voltage
45 V
ClassA; OperatingPoint1
Plate current
0.4 mA
ClassA; OperatingPoint1
Screen current
0.15 mA
ClassA; OperatingPoint1
Maximum plate voltage
90 V
Maximum screen voltage
90 V

Characteristics

Plate resistance
1000000 ohm
ClassA; OperatingPoint1
Conversion transconductance
200 uS
ClassA; OperatingPoint1

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
45 V
Plate current
0.4 mA

SECTION 2

Pentode

Other

Plate voltage
45 V
Grid 1 return resistance
5 megohm
Grid 2 voltage
45 V
Plate current
0.4 mA
Grid 2 current
0.15 mA

Characteristic

Plate resistance
1000000 ohm
Transconductance
200 uS

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
1.25 V
Nominal
Heater current
40 mA
Nominal

SECTION 2

Pentode

Other

Heater voltage
1.25 V
Nominal
Heater current
40 mA
Nominal

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
67.5 V
AudioAmplifier
Plate current
0.5 mA
AudioAmplifier
Application
Triode amplifier section
Section1

SECTION 2

Pentode

Other

Plate voltage
67.5 V
AudioOutput
Screen voltage
67.5 V
AudioOutput
Application
Low-power pentode section
Section2

Characteristic

Transconductance
200 µS
Section2