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3C5GT

Directly heated power pentode for Class-A audio output with series/parallel filament operation. Its flexible filament arrangement supports battery equipment requiring useful low-frequency output power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7AQ
Socket code: IO
Base pins: 7
Nominal heater: 1.4 V / 100 mA

Description

Directly heated power pentode for Class A audio output with series/parallel filaments.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7AQ
Socket code: IO
Base pins: 7
Nominal heater voltage: 1.4 V
Nominal heater current: 100 mA
Parallel heater voltage: 1.4 V
Parallel heater current: 100 mA
Series capable: Yes

7AQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Max plate voltage: 90 V
Max screen voltage: 90 V

Published ratings and characteristics promoted where clearly legible in the approved source.

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

Pentode

Other

Plate voltage
90 V
ClassA;ParallelFilaments
Screen-grid voltage
90 V
ClassA;ParallelFilaments
Grid No.1 bias
9 V
ClassA;ParallelFilaments
Plate current
6 mA
ClassA;ParallelFilaments
Screen-grid current
1.4 mA
ClassA;ParallelFilaments
Transconductance
1550 uS
ClassA;ParallelFilaments
Load resistance
8000 ohm
ClassA;ParallelFilaments
Power output
0.24 W
ClassA;ParallelFilaments
Plate voltage
90 V
ClassA;SeriesFilaments
Screen-grid voltage
90 V
ClassA;SeriesFilaments
Grid No.1 bias
9 V
ClassA;SeriesFilaments
Plate current
6 mA
ClassA;SeriesFilaments
Screen-grid current
1.4 mA
ClassA;SeriesFilaments
Transconductance
1450 uS
ClassA;SeriesFilaments
Load resistance
10000 ohm
ClassA;SeriesFilaments
Power output
0.26 W
ClassA;SeriesFilaments