Tube-number record
866 JR.
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BrandHytron
ClassRectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeMercury Vapor
EnvelopeST-16
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialCoated
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage1250 V
Cathode Current125 mA
Audio Performance
Key Features
- Hot-cathode
- Mercury-vapor
- High-voltage supply
- Half-wave
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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