Tube-number record
Z303C
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Z303C is a tube type in the TubeDatabase archive (class: Numerical Indicator Tube). Recorded specifications: brand Valvo, construction Other / special, and maximum plate voltage 475 V. The archive does not yet hold a photographed example of this type.
BrandValvo
ClassNumerical Indicator Tube
Construction
Primary TypeOther / special
EnvelopeGlass
Sections10-stage dekatron
Filament / Heater
Absolute Maximum Ratings
Plate Voltage475 V
Audio Performance
Key Features
- Transistor-controlled
- Dekadische Zählröhre
- Negative pulse triggering
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Counting | 475 V | — | — | — | — |
Application Notes
Described as being driven by a transistor blocking oscillator (OC72). Auxiliary cathodes (KA, KB) receive a static bias of approximately 36V, increasing to 42V during 4kHz operation.
Datasheets
Datasheet: Z303C.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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