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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

BALLAST

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BALLAST is a tube type in the TubeDatabase archive (class: Ballast Tube). Recorded specifications: brand National Union Radio Corporation, construction Other / special, and socket Octal. The archive does not yet hold a photographed example of this type.

BrandNational Union Radio Corporation
ClassBallast Tube
BaseOctal
Filament21 V @ 300 mA

Construction

Primary TypeOther / special
EnvelopeHG
SectionsSingle

Filament / Heater

Heater NotesListed as 21 volt drop at 300 mA (OCR interpreted 'al volt drop 740 wa')

Absolute Maximum Ratings

Audio Performance

Application Notes

Ballast tube for voltage drop in heater strings.

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    Key Features
    • HG type shell
    • Octal 6 pin base