Tube-number record
U.21
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BrandMazda
ClassHigh Voltage Rectifier
Base4-pin
Filament2 V @ 1850 mA
Construction
Primary TypeRectifier
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesDesigned to provide suitable time delay
Absolute Maximum Ratings
Plate Voltage4500 V
Cathode Current5 mA
Audio Performance
Key Features
- Indirectly heated
- Time delay heating
- High voltage television supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier (RMS 3700V) | 3700 V | — | — | — | 0.5 mA |
| Rectifier (RMS 4000V) | 4000 V | — | — | — | 0.5 mA |
| Rectifier (RMS 4500V) | 4500 V | — | — | — | 0.5 mA |
Application Notes
The U.21 avoids the use of special delay switching and protects the cathode ray tube from excessive voltage stress during heating time.
Datasheets
Datasheet: U21.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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