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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

6BF6

Receiving tube combining radio signal detection or control-voltage rectification with associated voltage amplification. Its detector function is integral to receiver signal processing and supports classification within the radio detector/converter family.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 7BT
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Low-mu voltage-amplifier triode combined with two detector diodes.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BT
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

7BT - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11G1	A	G1 — Control Grid EIA source label 1G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN2K	A	K — Cathode EIA source label K; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN3H	—	H — Heater EIA source label H; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN4H	—	H — Heater EIA source label H; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN52P	B	P — Plate (Anode) EIA source label 2P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN63P	C	P — Plate (Anode) EIA source label 3P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT
PIN71P	A	P — Plate (Anode) EIA source label 1P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BT

Section ratings

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 8500 Ω
Transconductance: 0.0019 S
Amplification factor: 16
Max plate voltage: 300 V
Max plate dissipation: 2.5 W
Rectifier max heater-cathode voltage: 200 V

Published promoted fields populated semantically; identical repeated sections compressed where applicable.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Rectifier max heater-cathode voltage: 200 V

Representative row for the two identical diode sections; published diode-current datum is a minimum-current characteristic, not a maximum rating.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Low-mu voltage-amplifier triode combined with two detector diodes.

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

Plate voltage
250 V
ClassA; OperatingPoint1
Control-grid bias
9 V
ClassA; OperatingPoint1
Plate current
9.5 mA
ClassA; OperatingPoint1
Plate resistance
8500 ohm
ClassA; OperatingPoint1
Transconductance
1900 uS
ClassA; OperatingPoint1
Amplification factor
16
ClassA; OperatingPoint1

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 2

Diode

Characteristic

Plate Resistance
8500 ohm
Triode
Transconductance
1500 uS
Triode

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

GRID TO PLATE: (G TO TP)
1.9 pF
Triode Section | GRID TO PLATE: (G TO TP) 1.9 1.9 pf
VOLTAGE OPERATION
0.6 V
Average Characteristics | VOLTAGE OPERATION 6.3±0.6 volts
CURRENT OPERATION
20 mA
Average Characteristics | CURRENT OPERATION 300±20 MA.

Other

PLATE DISSIPATION
2.5 W
Maximum Ratings | PLATE DISSIPATION 2.5 WATTS
PLATE VOLTAGE
250 V
Maximum Ratings | PLATE VOLTAGE 250 voLTs
GRID VOLTAGE —
9 V
Maximum Ratings | GRID VOLTAGE —9 voLTs
PLATE RESISTANCE
8500 ohm
Maximum Ratings | PLATE RESISTANCE 8500 OHMS
PLATE CURRENT
9.5 mA
Maximum Ratings | PLATE CURRENT 9.5 MA•
LOAD RESISTANCE
10000 ohm
Maximum Ratings | LOAD RESISTANCE 10000 OHMS

SECTION 2

Diode

Characteristic

#
0.06 pF
Diode Section | #1 DIODE PLATE TO GRID: (iDP TO G) MAX. 0.07 0.06 pf
#
0.66 pF
Diode Section | #1 DIODE PLATE TO HEATER ANO CATHODE 0.66 pf

Other

DIODE CURRENT EACH PLATE WITH
10 V
Maximum Ratings | DIODE CURRENT EACH PLATE WITH 10 VOLTS DC APPLIED (MIN.) O.8 MA.
DIODE CURRENT EACH PLATE WITH
8 mA
Maximum Ratings | DIODE CURRENT EACH PLATE WITH 10 VOLTS DC APPLIED (MIN.) O.8 MA.

SECTION 3

Diode

Characteristic

#
0.05 pF
Diode Section | #2 DIODE PLATE TO GRID: (2DP TO G) MAX. 0.06 0.05 pf
#
0.95 pF
Diode Section | #2 DIODE PLATE TO HEATER AND CATHODE 0.95 pf

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Voltage
250 V
ClassA
Grid Voltage
-9 V
ClassA
Plate Current
9.5 mA
ClassA
Load Resistance
10000 ohm
ClassA
Total Harmonic Distortion
6.5 %
ClassA
Power Output
300 mW
ClassA

SECTION 2

Diode

Characteristic

MinimumDiodeCurrentPerPlate
0.6 mA
AppliedDC=10V