QT1257
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BrandEnglish Electric Valve Company Limited
ClassCold Cathode Touch Button Tube
BaseInternational Octal Base
Construction
Primary TypeCold Cathode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage325 V
Cathode Current25 mA
Audio Performance
Key Features
- Self-indicating electronic switch
- Actuated by touch
- Emits visible glow
- Cold cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Maintaining | 80V | - | - | - | 10mA |
| Load Conditions | - | - | - | - | 15mA |
Application Notes
Commonly used in lift control panels (e.g., Otis) for floor selection. Activated by body capacitance when the external control electrode is touched.
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