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

6T7G

Double-diode triode combining radio detector and AVC rectification with subsequent voltage amplification. The paired diodes handle signal and control-voltage functions while the triode provides receiver audio or voltage gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 7V
Socket code: IO
Base pins: 7
Nominal heater: 6.3 V / 150 mA

Description

High-mu double-diode triode for detector and voltage-amplifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7V
Socket code: IO
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7V - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Representative row for identical repeated sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62000 Ω
Transconductance: 0.00106 S
Amplification factor: 65
Max plate voltage: 250 V

High-mu triode section.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 2

Triode

Capacitance

Grid-to-plate capacitance
1.3 pF
Section1
Input capacitance
2.7 pF
Section1
Output capacitance
4.5 pF
Section1

Other

Plate voltage
135 V
ClassA
Grid bias
-1.5 V
ClassA
Plate current
0.9 mA
ClassA
Plate voltage
250 V
ClassA
Grid bias
-3 V
ClassA
Plate current
1.2 mA
ClassA

Characteristic

Plate resistance
65000 Ω
135VPlate
Transconductance
1000 µS
135VPlate
Amplification factor
65
Section1
Plate resistance
62000 Ω
250VPlate
Transconductance
1050 µS
250VPlate

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Triode

Capacitance

Input capacitance
1.8 pF
Output capacitance
3.1 pF
Grid-plate capacitance
1.7 pF

Other

Plate voltage
250 V
ClassA
Grid voltage
-3 V
ClassA
Plate current
1.2 mA
ClassA

Characteristics

Plate resistance
62000 ohm
ClassA
Transconductance
1050 uS
ClassA
Amplification factor
65
ClassA