Z 550 M
0 Tubes in archive
BrandPhilips
ClassDecade Indicator Tube
Construction
Primary TypeCold cathode gas-filled decade numerical indicator
EnvelopeGlass
Base MaterialMolybdenum
Sections10
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Numerical figures 0 to 9
- Cold cathode
- Molybdenum cathode ring
- Full-wave rectified unsmoothed voltage feed
- No intervening high voltage transistors required
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Self-counting circuit | 250V | - | - | - | 0.05mA |
Application Notes
The tube is developed for use as an indicator that requires a bias of less than five volts at 50 /uA to switch the discharge. It can be used in solid-state scalers and industrial counting devices.
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