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Voltage Tetrode ·Tetrode

283A

Western Electric variable-mu screen-grid tetrode for controlled high-frequency and audio-frequency voltage amplification, using extended cutoff for receiver gain regulation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM5
Base pins
5
Nominal heater
2 V / 1.6 A

Description

Indirectly heated variable-mu screen-grid tetrode for high-frequency and audio-frequency voltage amplification.

Socket description

Medium 5-contact transmitting-tube base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM5
Base pins
5
Nominal heater voltage
2 V
Nominal heater current
1.6 A
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

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
700000 Ω
Transconductance
0.0014 S
Amplification factor
980
Max plate voltage
250 V
Max screen voltage
75 V
Max cathode current
6 mA

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

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • ControlGridToPlateCapacitance

    0.004 pF

  • ControlGridToHeaterCathodeScreenGridCapacitance

    6.5 pF

  • PlateToHeaterCathodeScreenGridCapacitance

    14 pF