AT4

Acorn triode for high-frequency amplifier, oscillator, and detector service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 280 mA

Description

Acorn triode for HF amplifier, oscillator, and detector service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 280 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.002 S
Amplification factor: 20
Max plate voltage: 180 V
Max plate dissipation: 1.5 W

Published Mullard ratings, characteristics, capacitances, and operating data promoted where applicable; additional electrical values retained as parameters.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
4 V
Heater current
280 mA
Transconductance approximate
2 mA/V

Other

Plate voltage maximum
180 V
Plate dissipation maximum
1.5 W

Application

Application
HF amplifier / oscillator / detector