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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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4A21 vacuum tube outline illustration

Tube-number record

4A21

0 archive entries

4A21 is a tube type in the TubeDatabase archive (class: Ballast Tube). Recorded specifications: brand General Electric Co., construction Other / special, and socket Special / none. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric Co.
ClassBallast Tube
BaseSpecial / none

Construction

Primary TypeOther / special
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialIron Wire

Absolute Maximum Ratings

Cathode Current1700 mA

Datasheets

Datasheet: 4A21.pdf

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

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    Audio Performance

    Key Features
    • Current regulation ±2%
    • Iron wire element
    • Mounting position Any