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

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21AFP4 vacuum tube outline illustration

Tube-number record

21AFP4

0 archive entries

21AFP4 is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand SYLVANIA, construction Display / CRT, socket Duodecal, and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.

BrandSYLVANIA
ClassTelevision Picture Tube
BaseDuodecal
Filament6.3 V @ 600 mA

Construction

Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage18000 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Recommended Operating Conditions16000 V————

Application Notes

X-ray radiation shielding may be necessary if operated higher than maximum rated anode voltage.

Datasheets

Datasheet: 21AFP4.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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    Grid 2 Voltage500 V
    Grid 1 Voltage-125 V
    H-C Voltage180 V

    Audio Performance

    Key Features
    • Direct Viewed
    • Rectangular Glass Type
    • Spherical Faceplate
    • Gray Filter Glass
    • Single Field Ion Trap