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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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R78A vacuum tube outline illustration

Tube-number record

R78A

0 archive entries

R78A is a tube type in the TubeDatabase archive (class: Gas Phototube). Recorded specifications: brand Visitron, construction Other / special, socket 4-pin, and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.

BrandVisitron
ClassGas Phototube
Base4-pin

Construction

Primary TypeOther / special
EnvelopeGlass
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage90 V

Audio Performance

Application Notes

Commonly used in standard theatre projection equipment.

Filters

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Manufacturers

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    Key Features
    • Extra large cathode
    • Sturdy construction
    • Constant quality performance