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25QP21

Cathode-ray display tube with electromagnetic focusing and deflection, intended for measuring and industrial instruments. Its approximately 240 mm useful screen provides a relatively large direct-view display for instrumentation rather than television receiver service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 700 mA

Description

Cathode-ray display tube with electromagnetic deflection and focusing, intended for measuring and industrial instruments.

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: 6.3 V
Nominal heater current: 700 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

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics promoted from the source where directly stated.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
700 mA
Published nominal value
Useful screen diameter
240 mm
Published screen size