Tube-number record
P-568
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BrandSYLVANIA
ClassGas Filled Phototube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeUltraviolet transmitting glass
SectionsTwo symmetrically arranged electrodes
Filament / Heater
Absolute Maximum Ratings
Plate Voltage1000 V
Cathode Current10 mA
Audio Performance
Key Features
- Sensitive only to ultraviolet radiation
- Symmetrically arranged electrodes
- Direct relay operation
- Blind to visible light
- Operates on alternating voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AC Supply Operation | 500 V | — | — | — | 6 mA |
Application Notes
Applications include flame detector for furnace control, fire detection, and ultraviolet radiation detection and measurements. High output current allows for direct relay operation.
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