Tube-number record
Z803U
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BrandPhilips
ClassGas-filled cold-cathode relay tube
BaseNoval (B9A)
Construction
Primary TypeOther / special
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage290 V
Grid 1 Voltage137 V
Cathode Current25 mA
Audio Performance
Key Features
- Positive starter voltage
- Positive anode voltage
- Light-independent operation
- High starter stability
- Self-extinguishing capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Burning | 105 V | — | — | — | 25 mA |
| Ignition | 280 V | — | — | — | — |
Application Notes
Designed for voltage control, sensitive relay circuits, and timers. Priming current of approximately 10 uA should flow to ensure stability in darkness. Priming resistor must be soldered directly to pin 6.
Datasheets
Datasheet: Z803U.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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