Tube-number record
866 JR.
0 archive entries
866 JR. is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Hytron, construction Rectifier, base Metal, socket 4-pin, and maximum plate voltage 1250 V. The archive does not yet hold a photographed example of this type.
BrandHytron
ClassRectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeMercury Vapor
EnvelopeST-16
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialCoated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-phase full-wave (2 tubes) - Choke Input | 1250 V | — | — | — | 250 mA |
| Single-phase full-wave (2 tubes) - Condenser Input | 1250 V | — | — | — | 200 mA |
Application Notes
Tube must be operated in a vertical position with the base down. Filament voltage must be maintained within 5% of 2.5V. A 30-second delay is required before applying plate voltage. Initial use requires 15 minutes of filament operation without plate voltage to distribute mercury.
Datasheets
Datasheet: 866Jr.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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