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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

4A

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4A is a tube type in the TubeDatabase archive (class: Vacuum Tube). Recorded specifications: brand National Union Radio Corporation. The archive does not yet hold a photographed example of this type.

BrandNational Union Radio Corporation
ClassVacuum Tube

Construction

Filament / Heater

Absolute Maximum Ratings

Audio Performance

Key Features
  • Standard base connections

Application Notes

As this tube is well known to the industry it is not necessary that this committee distribute technical data to the manufacturers.

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