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A442

Directly heated battery tetrode for low-power receiver amplifier service, designed for economical operation from portable low-voltage supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: A35-3
Socket code: -
Base pins: 4
Nominal heater: 4 V / 60 mA

Description

Directly heated battery tetrode for low-power receiver amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: A35-3
Socket code: -
Base pins: 4
Nominal heater voltage: 4 V
Nominal heater current: 60 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

A35-3 - 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

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.0007 S
Amplification factor: 280
Max plate voltage: 200 V
Max screen voltage: 100 V

Promoted only from clearly identified published characteristics/limits; additional operating, capacitance, regulator, gas-tube, and push-pull data retained as section 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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Plate current
4 mA
BatteryValve
Control-grid voltage
-1 V
BatteryValve
Screen voltage
100 V
BatteryValve
Screen current
0.8 mA
BatteryValve

Characteristic

Plate resistance
400000 Ω
Section1
Transconductance
700 µS
Section1
Amplification factor
280
Section1

Capacitance

Grid-to-anode capacitance
0.01 pF
Section1