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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

ESU 300

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ESU 300 is a tube type in the TubeDatabase archive (class: Mercury Vapour Rectifier). Recorded specifications: brand Ediswan, construction Rectifier, and socket Screw / Edison base. The archive does not yet hold a photographed example of this type.

BrandEdiswan
ClassMercury Vapour Rectifier
BaseScrew / Edison base

Construction

Primary TypeRectifier
Rectifier TypeMercury Vapour
EnvelopeHard Glass
SectionsSingle

Filament / Heater

Warm-up Time30s

Absolute Maximum Ratings

Cathode Current3000 mA

Audio Performance

Key Features
  • Mercury vapour filled
  • Blue glow characteristic
  • Neutralized space-charge
  • Low internal resistance
  • Excellent regulation
  • Top anode terminal

Application Notes

The filament must be switched on at least 30 seconds before anode voltage is applied. For first service, filament should operate at normal voltage for 15 minutes without anode voltage to distribute mercury. Mount vertically in a well-ventilated position. Maximum ambient temperature 50°C.

Datasheets

Datasheet: ESU300.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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