20P4

Television beam-power amplifier specifically designed for magnetic time-base output service, with very high positive anode and negative screen pulse-voltage ratings.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 38 V / 200 mA

Description

Television beam power amplifier designed for magnetic time-base output service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 38 V
Nominal heater current: 200 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

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 400 V
Max screen voltage: 250 V
Max plate dissipation: 10 W
Max screen dissipation: 4 W
Max cathode current: 150 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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum peak anode voltage
6000 V
Pulse positive
Maximum peak screen voltage
1500 V
Pulse negative