TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

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)
DisclaimerA–Z indexSubmit a tube
866 vacuum tube outline illustration

Tube-number record

866

0 archive entries

866 is a tube type in the TubeDatabase archive (class: Half-wave mercury-vapor rectifier). Recorded specifications: brand Hytron, construction Rectifier, socket 4-pin, and maximum plate voltage 2650 V. The archive does not yet hold a photographed example of this type.

BrandHytron
ClassHalf-wave mercury-vapor rectifier
Base4-pin

Construction

Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeST-19
SectionsSingle

Filament / Heater

MaterialCoated
Warm-up Time30s

Absolute Maximum Ratings

Application Notes

Requires a 30-second filament preheating period before plate voltage is applied. For new tubes or those moved, operate filament for 15 minutes without plate voltage to distribute mercury. Should be mounted vertically with base down.

Datasheets

Datasheet: 866.pdf

Download PDF
Loading datasheet...

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

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Plate Voltage2650 V
    Cathode Current250 mA

    Audio Performance

    Key Features
    • Hot-cathode
    • Mercury vapor
    • High-voltage
    • Coated filament