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21VAKP22

Twenty-one-inch color television picture tube with electrostatic focusing, magnetic deflection, and a P22 color screen. Its high-voltage direct-view construction is designed for color receiver service and carries published X-ray precautions.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 48E
Socket code: -
Base pins: 12
Nominal heater: 6.3 V / 900 mA

Description

21VAKP22 is a color picture tube using electrostatic focusing and magnetic deflection. The source specifies a P22 screen and publishes CRT accelerating/anode ratings, control and focusing-electrode limits, heater-cathode limits, capacitances, and operating or deflection characteristics.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 48E
Socket code: -
Base pins: 12
Nominal heater voltage: 6.3 V
Nominal heater current: 900 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

48E - 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

Max plate voltage: 27500 V

CRT maximum accelerating/anode/ultor voltage is promoted to MaxPlateVoltage; additional electrode ratings, capacitances, operating conditions, focus/deflection and optical data are preserved as 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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater current
900 mA
At6.3V
Faceplate light transmission
66 %
Approximate

Capacitance

Grid 1 to all other electrodes
7.5 pF
Grid 3 to all other electrodes
6.5 pF
Cathode to all other electrodes
15 pF

Other

Minimum anode/ultor voltage
20000 V
Maximum long-term average anode current
1000 µA
Maximum grid 3 voltage
6000 V
Maximum grid 1 negative-bias voltage
400 V
NegativeBias
Maximum grid 1 negative operating cutoff voltage
200 V
NegativeCutoff
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
2 V
PositivePeak
Grid 3 focus voltage as percent of anode voltage
16.8 to 20 %
Focus
Maximum grid 3 circuit resistance
7.5 MΩ
Typical anode/ultor voltage
25000 V
Typical white-light output
58 fL
X-radiation reference anode voltage
35000 V
XRayReference