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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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R85A vacuum tube outline illustration

Tube-number record

R85A

0 archive entries

R85A is a tube type in the TubeDatabase archive (class: Phototube). Recorded specifications: brand Visitron, construction Other / special, and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.

BrandVisitron
ClassPhototube

Construction

Primary TypeOther / special
EnvelopeGlass
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage90 V

Audio Performance

Key Features
  • Non-directional
  • 360° pickup
  • Gas amplification
  • Increased sensitivity

Application Notes

Ideal for multi-directional applications such as target games, burglar alarms, and fire alarms.

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