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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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20SP4 vacuum tube outline illustration

Tube-number record

20SP4

0 archive entries

20SP4 is a tube type in the TubeDatabase archive (class: Picture Tube). Recorded specifications: brand RCA, year 1968, construction Other / special, base Neo-eightar, and socket CRT base (B7 family). The archive does not yet hold a photographed example of this type.

BrandRCA
ClassPicture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 450 mA

Construction

Primary TypeOther / special
EnvelopeFilterglass
Base MaterialNeo-eightar
Sections1

Filament / Heater

Heater NotesHeater Warm-Up Time (Average): 11 seconds

Absolute Maximum Ratings

Typical Operation

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

Application Notes

The grid-No.4 voltage required for optimum focus will have a value between -100 and +300 volts.

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Manufacturers

Brands

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    Grid 2 Voltage60 V
    H-C Voltage450 V

    Audio Performance

    Key Features
    • Pan-o-Ply Type
    • Low Grid-No.2 Voltage
    • No Ion-Trap Magnet required
    • Implosion Protection