281
0 Tubes in archive
ClassRectifier
BaseUX4
Construction
Primary TypeHalf-wave Rectifier
Rectifier TypeVacuum
EnvelopeST-19
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage700 V
Cathode Current85 mA
Audio Performance
Key Features
- Directly heated filament
- High voltage half-wave rectifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Half-wave Rectifier | 700V | - | - | - | 85mA |
Application Notes
The 281 is a half-wave vacuum rectifier designed for use in power supplies of early radio receivers. It is equivalent to the 81 tube.
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