258B
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BrandWestern Electric
ClassRectifier
BaseWestern Electric 188B, 189A
Construction
Primary TypeHalf wave, thermionic, mercury vapor rectifier
Rectifier TypeHalf-wave
EnvelopeGlass
Base MaterialMedium two-pin thrust type
SectionsSingle
Filament / Heater
MaterialMercury vapor type
Warm-up Time15s
Absolute Maximum Ratings
Plate Voltage7500 V
Cathode Current1500 mA
Audio Performance
Key Features
- Half-wave thermionic
- Mercury vapor
- Top cap anode terminal
- Thrust-type base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Mercury Vapor Operation | 15V | - | - | - | - |
Application Notes
The tube should be mounted only in a vertical position with the base end down. Sufficient time must be allowed for filament temperature to reach operating value (15 seconds) before anode potential is applied. Preheating of 10-15 minutes is required for new tubes or after reinsertion.
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