6964

Twin triode documented in receiving-tube handbook data; available source material establishes the device construction but does not clearly support a more specialized application classification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7BF
Socket code: -
Base pins: 7
Nominal heater: 6.3 V / 450 mA

Description

6964 is a twin triode listed in the supplied receiving-tube handbook.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BF
Socket code: -
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 450 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: 6500 Ω
Transconductance: 0.006 S
Amplification factor: 39
Max plate voltage: 250 V

Published maximum ratings and representative operating characteristics reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6500 Ω
Transconductance: 0.006 S
Amplification factor: 39
Max plate voltage: 250 V

Second physical triode section; electrically identical twin section.

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

Maximum plate voltage
250 V
Published handbook rating
Plate voltage
150 V
ClassA
Control-grid bias
0 V
ClassA
Plate current
5.1 mA
ClassA

Characteristic

Plate resistance
6500 ohm
Published handbook characteristic
Transconductance
6000 µS
Published handbook characteristic
Amplification factor
39
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
450 mA
Published heater/filament rating