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

6AT6

Double-diode high-mu triode for radio detector, AVC, and audio voltage-amplifier service. The paired diodes provide signal and control-voltage rectification while the triode supplies subsequent audio gain.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Twin-diode high-mu triode used as a combined detector, amplifier, and AVC tube in automobile and AC-operated radio receivers.

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

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 1 mA
Rectifier peak inverse voltage: 330 V
Rectifier nominal output current: 1 mA

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 0.8 mA
Rectifier peak inverse voltage: 330 V
Rectifier nominal output current: 1 mA

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 58000 Ω
Transconductance: 0.0012 S
Amplification factor: 70
Max plate voltage: 300 V
Max plate dissipation: 0.5 W
Rectifier max heater-cathode voltage: 90 V

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 3

Triode

Characteristic

Plate Characteristic Grid Voltage
0 V
CurveFamily
Plate Characteristic Grid Voltage
-0.5 V
CurveFamily
Plate Characteristic Grid Voltage
-1 V
CurveFamily
Plate Characteristic Grid Voltage
-1.5 V
CurveFamily
Plate Characteristic Grid Voltage
-2 V
CurveFamily
Plate Characteristic Grid Voltage
-3 V
CurveFamily
Plate Characteristic Grid Voltage
-4 V
CurveFamily
Plate Characteristic Grid Voltage
-5 V
CurveFamily
Plate Characteristic Grid Voltage
-6 V
CurveFamily
Plate Characteristic Grid Voltage
-7 V
CurveFamily
Curve Plate Voltage Maximum
500 V
CurveFamily
Curve Plate Current Maximum
7 mA
CurveFamily

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Diode

Other

Plate voltage
250 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
1 mA
ClassA

Characteristic

Plate resistance
58000 Ω
ClassA
Transconductance
1200 µS
ClassA
Amplification factor
70
ClassA

SECTION 3

Triode

Other

Plate voltage
250 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
1 mA
ClassA

Characteristic

Plate resistance
58000 Ω
ClassA
Transconductance
1200 µS
ClassA
Amplification factor
70
ClassA

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 3

Triode

Other

Heater voltage
6.3 V
Heater current
300 mA
Plate voltage
250 V
ClassA2
Plate current
1 mA
ClassA2

Capacitance

Grid to plate
2.1 pF

Data set 04

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Plate voltage
250 V
Published table
Control-grid bias
-3 V
Published table
Plate current
1 mA
Published table

Characteristic

Transconductance
1200 µS
Published table
Amplification factor
58
Published table
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 05

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
300 mA
DiodeToCathodeCapacitance
1.4 pF

Other

PeakInverseVoltageMaximum
330 V
Diode
DCOutputCurrentMaximum
1 mA
Diode

SECTION 2

Diode

Other

PeakInverseVoltageMaximum
330 V
Diode
DCOutputCurrentMaximum
1 mA
Diode

Characteristic

DiodeToCathodeCapacitance
1.4 pF

SECTION 3

Triode

Characteristic

Plate Voltage
250 V
Grid Voltage
-3 V
Plate Current
1 mA
Plate Resistance
54000 ohm
Transconductance
1300 uS
Amplification Factor
70
Grid To Plate Capacitance
2 pF
Input Capacitance
3 pF
Output Capacitance
1.7 pF

Data set 06

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

Heater voltage
6.3 V
Published table
Heater current
300 mA
Published table
Triode plate resistance
63000 ohm
TriodeSection
Triode transconductance
2200 µS
TriodeSection
Triode amplification factor
70
TriodeSection

Other

Triode plate voltage
250 V
TriodeSection
Triode plate current
1 mA
TriodeSection

Data set 07

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Continuous Diode Current
1 mA
EachDiode

Data set 08

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Heater voltage nominal
6.3 V
Heater current
300 mA
Maximum plate current
1 mA

Characteristics

Plate current at 10 V
2 mA

SECTION 2

Diode

Other

Heater voltage nominal
6.3 V
Heater current
300 mA
Maximum plate current
1 mA

Characteristics

Plate current at 10 V
2 mA

SECTION 3

Triode

Other

Heater voltage nominal
6.3 V
Heater current
300 mA
Maximum plate voltage
300 V
ClassA1
Maximum plate dissipation
0.5 W
ClassA1

Characteristics

Plate voltage
250 V
ClassA1
Amplification factor
70
ClassA1
Plate resistance
58000 ohm
ClassA1
Transconductance
1200 µS
ClassA1
Plate current
1 mA
ClassA1

Data set 09

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 2

Diode

Other

Heater Voltage (ac/dc) 6.3
12.6 V
Published in approved 6AT6 target entry; Section2
Heater Current 0.3
150 mA
Published in approved 6AT6 target entry; Section2
Triode Grid to Triode Plate
2 pF
Published in approved 6AT6 target entry; Section2
Triode Grid to Cathode and Heater
2.2 pF
Published in approved 6AT6 target entry; Section2
Triode Plate to Cathode and Heater
0.8 pF
Published in approved 6AT6 target entry; Section2
Plate Voltage
300 V
Published in approved 6AT6 target entry; Section2
Plate Dissipation
0.5 W
Published in approved 6AT6 target entry; Section2
Grid Voltage, Positive-bias value
0 V
Published in approved 6AT6 target entry; Section2
Plate Voltage 100
250 V
Published in approved 6AT6 target entry; Section2
Grid Voltage —1
-3 V
Published in approved 6AT6 target entry; Section2
Plate Resistance 54000
58000 Ω
Published in approved 6AT6 target entry; Section2
Transconductance 1300
1200 µS
Published in approved 6AT6 target entry; Section2
Plate Current 0.8
1 mA
Published in approved 6AT6 target entry; Section2
frequency in the order of
40 MHz
Published in approved 6AT6 target entry; Section2

SECTION 3

Triode

Other

Heater Voltage (ac/dc) 6.3
12.6 V
Published in approved 6AT6 target entry; Section1
Heater Current 0.3
150 mA
Published in approved 6AT6 target entry; Section1
Triode Grid to Triode Plate
2 pF
Published in approved 6AT6 target entry; Section1
Triode Grid to Cathode and Heater
2.2 pF
Published in approved 6AT6 target entry; Section1
Triode Plate to Cathode and Heater
0.8 pF
Published in approved 6AT6 target entry; Section1
Plate Voltage
300 V
Published in approved 6AT6 target entry; Section1
Plate Dissipation
0.5 W
Published in approved 6AT6 target entry; Section1
Grid Voltage, Positive-bias value
0 V
Published in approved 6AT6 target entry; Section1
Plate Voltage 100
250 V
Published in approved 6AT6 target entry; Section1
Grid Voltage —1
-3 V
Published in approved 6AT6 target entry; Section1
Plate Resistance 54000
58000 Ω
Published in approved 6AT6 target entry; Section1
Transconductance 1300
1200 µS
Published in approved 6AT6 target entry; Section1
Plate Current 0.8
1 mA
Published in approved 6AT6 target entry; Section1
frequency in the order of
40 MHz
Published in approved 6AT6 target entry; Section1