263B
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BrandWestern Electric
ClassFull wave mercury vapor rectifier
BaseWestern Electric 139A or similar
Construction
Primary Typethermionic
Rectifier Typefull wave
Envelopeglass
Sections2
Filament / Heater
Warm-up Time120s
Absolute Maximum Ratings
Plate Voltage100 V
Cathode Current10000 mA
Audio Performance
Key Features
- blue glow
- thermionic
- double-ended bulb
- mercury vapor
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier | 10V | - | - | - | - |
Application Notes
The tube should be mounted preferably in a vertical position with the filament terminal end down. If mounted horizontally, the plane of the anode and filament terminals should be horizontal. Sufficient time (2 minutes) must always be allowed for the filament temperature to reach its normal operating value before anode potential is applied.
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