5844

Miniature medium-mu twin triode specifically designed for moderately high-speed electronic-computer switching and amplifier service, with characteristics suited to digital logic and control circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7BF
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Miniature medium-mu twin triode designed for moderately high-speed electronic computer switching and amplifier service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BF
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7BF - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN21P	A	P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN3H	—	H — Heater EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN4H	—	H — Heater EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN51G1	A	G1 — Control Grid EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN62G1	B	G1 — Control Grid EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF
PIN7K	A	K — Cathode EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BF

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7950 Ω
Transconductance: 0.0034 S
Amplification factor: 27
Max plate voltage: 175 V
Max plate dissipation: 0.5 W
Max cathode current: 9 mA

Promoted from clearly identified printed ratings/characteristics; additional published operating points, capacitances, and specialized ratings retained in TUBE_SECTION_PARAMETER.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7950 Ω
Transconductance: 0.0034 S
Amplification factor: 27
Max plate voltage: 175 V
Max plate dissipation: 0.5 W
Max cathode current: 9 mA

Second physical triode restored under current one-row-per-physical-section policy.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Resistance
7950 ohm
Transconductance
3400 µS
Amplification Factor
27

Other

Maximum Plate Voltage
175 V
Maximum Plate Dissipation
0.5 W
Maximum Cathode Current
9 mA
Plate Voltage
100 V
EachSection
Cathode Bias Resistor
470 ohm
EachSection
Plate Current
4.8 mA
EachSection
Plate Supply Voltage
150 V
ComputerService

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Input capacitance
2.4 pF
EachSection
Output capacitance
0.5 pF
EachSection
Grid-to-plate capacitance
2.7 pF
EachSection

Other

Plate voltage
100 V
ClassA;EachSection
Cathode resistor
470 Ω
ClassA;EachSection
Plate current
4.8 mA
ClassA;EachSection
Plate voltage
150 V
FrequencyHalver;EachSection

Characteristic

Plate resistance
7950 Ω
EachSection
Transconductance
3400 µS
EachSection
Amplification factor
27
EachSection