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1G6GT

Directly heated twin-triode power amplifier for battery receivers, designed for Class-B push-pull audio output from a low-voltage 1.4 V filament supply.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7AB
Socket code: IO
Base pins: 8
Nominal heater: 1.4 V / 100 mA

Description

Directly heated twin-triode power-amplifier tube; identical triodes are compressed to one section row.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7AB
Socket code: IO
Base pins: 8
Nominal heater voltage: 1.4 V
Nominal heater current: 100 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7AB - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 40000 Ω
Transconductance: 0.000825 S
Amplification factor: 33
Max plate voltage: 110 V
Max cathode current: 20 mA

Representative row for two electrically identical triode units; maximum peak plate current is 20 mA per plate.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 40000 Ω
Transconductance: 0.000825 S
Amplification factor: 33
Max plate voltage: 110 V
Max cathode current: 20 mA

Identical second physical section; duplicated from representative section per physical-section-row policy.

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
110 V
EachSection
Plate voltage
90 V
ClassA EachSection
Control-grid voltage
0 V
ClassA EachSection
Plate current
1 mA
ClassA EachSection
Plate resistance
40000 Ohm
ClassA EachSection
Transconductance
825 uS
ClassA EachSection
Amplification factor
33
ClassA EachSection
Plate voltage
90 V
ClassB PushPull TwoSections
Control-grid voltage
0 V
ClassB PushPull TwoSections
Plate current
2 mA
ClassB PushPull TwoSections
Load resistance
12000 Ohm
ClassB PushPull TwoSections
Power output
0.675 W
ClassB PushPull TwoSections

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum Peak Plate Current Per Plate
20 mA
PerPlate
Power Output
0.675 W
ClassB;PlateVoltage=90V
Total Harmonic Distortion
3 %
ClassB