Tube-number record
Z505S
0 archive entries
Z505S is a tube type in the TubeDatabase archive (class: Selector Tube). Recorded specifications: year 1969, construction Other / special, socket CRT / special base, and maximum plate voltage 1000 V. The archive does not yet hold a photographed example of this type.
ClassSelector Tube
BaseCRT / special base
Construction
Primary TypeOther / special
EnvelopeGlass
SectionsTen main cathodes
Filament / Heater
Absolute Maximum Ratings
Plate Voltage1000 V
Cathode Current1 mA
Audio Performance
Key Features
- Bi-directional decade selector
- Counting tube
- Visual indication
- End viewing
- Ten main cathodes brought out separately
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended | 300 V | — | — | — | 0.8 mA |
Application Notes
Designed for visual indication and operation at speeds up to 50 kHz. All voltages are referred to the most positive supply potential to which any main cathode is returned.
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