6920

Medium-mu twin triode providing two closely related triode sections for general voltage-amplifier service, with published operating characteristics for miniature electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7BF
Socket code: -
Base pins: 7
Nominal heater: 6.3 V / 400 mA

Description

6920 is listed in the supplied receiving-tube handbook as a medium-mu twin triode. The published heater/filament rating is 6.3 V at 0.4 A. Maximum ratings, representative operating characteristics, and available special-service data were captured from the supplied table.

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: 400 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

Transconductance: 0.0055 S
Amplification factor: 25
Max plate voltage: 150 V

Published maximum ratings, representative operating conditions, and available capacitance/rectifier data reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0055 S
Amplification factor: 25
Max plate voltage: 150 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
150 V
Published handbook rating
Plate voltage
100 V
ClassA
Control-grid bias
1.8 V
ClassA
Plate current
8.5 mA
ClassA
Frequency-halfer plate voltage
150 V
FrequencyHalfer
Frequency-halfer control-grid voltage
0 V
FrequencyHalfer
Frequency-halfer plate current
4.5 mA
FrequencyHalfer
Frequency-halfer grid resistor
47000 ohm
FrequencyHalfer
Frequency-halfer load resistance
20000 ohm
FrequencyHalfer

Characteristic

Transconductance
5500 µS
Published handbook characteristic
Amplification factor
25
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
400 mA
Published heater/filament rating