249B
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BrandWestern Electric
ClassRectifier
BaseMedium four-pin thrust type
Construction
Primary TypeMercury Vapor Rectifier
Rectifier TypeHalf-wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThermionic
Warm-up Time15s
Absolute Maximum Ratings
Plate Voltage7500 V
Cathode Current1500 mA
Audio Performance
Key Features
- Mercury vapor
- Half-wave
- Vertical mounting
- Top cap anode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier | 15V | - | - | - | 1500mA |
Application Notes
The tube should be mounted only in a vertical position with the base end down. Allow 15 seconds warmup time for the filament. For ambient temperatures below 15C, longer warmup times (up to 15 minutes) are required to reach proper mercury vapor pressure.
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