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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Tube-number record

21EXPA

0 archive entries

21EXPA is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand Sylvania, year 1959, construction Display / CRT, socket CRT base (B7 family), and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 300 mA

Construction

Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Sections1

Filament / Heater

Heater NotesHeater warm-up time is 11 seconds

Absolute Maximum Ratings

Plate Voltage20000 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Grid Drive Service16000 V————

Application Notes

X-ray radiation shielding may be necessary if operated at higher than 16,000 volts.

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Grid 2 Voltage600 V
    Grid 1 Voltage-154 V
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Direct Viewed
    • Spherical Faceplate
    • Gray Filter Glass
    • Aluminized Screen
    • Tri-Potential Electrostatic Focus
    • 110° Magnetic Deflection
    • No Ion Trap
    • Short Neck