A441N

Directly heated double-grid battery valve using a space-charge grid for low-voltage receiver service, enabling useful amplification from unusually small anode supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: A35B-4
Socket code: -
Base pins: 4
Nominal heater: 4 V / 80 mA

Description

Directly heated double-grid battery valve using a space-charge grid for low-voltage receiver service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: A35B-4
Socket code: -
Base pins: 4
Nominal heater voltage: 4 V
Nominal heater current: 80 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

A35B-4 - 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

Transconductance: 0.001 S
Max plate 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
DoubleGridValve
Control-grid voltage
0 V
DoubleGridValve
Space-charge-grid voltage
4 V
DoubleGridValve

Characteristic

Control-grid conductance
0.3 mA/V
DoubleGridValve
Space-charge-grid conductance
1 mA/V
DoubleGridValve