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

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Tube-number record

BALLAST

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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

Key Features
  • HG type shell
  • Octal 6 pin base

Application Notes

Ballast tube for voltage drop in heater strings.

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