Tube-number record
Z520M
0 archive entries
Z520M is a tube type in the TubeDatabase archive (class: Decade Numerical Indicator Tube). Recorded specifications: brand Philips, construction Other / special, and socket Special / none. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassDecade Numerical Indicator Tube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeFilter-coated bulb
Sections10 cathodes (figures 0-9)
Filament / Heater
Absolute Maximum Ratings
Cathode Current2.5 mA
Audio Performance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static | 140 V | — | — | — | 2 mA |
| Static | 140 V | — | — | — | 1.96 mA |
| Static | 140 V | — | — | — | 1.95 mA |
Application Notes
The tube is designed to convert electrical information into optical signals. The figures become visible at the same spot, making possible 'in-line' read-out. Used in digital voltmeters, cash registers, and calculating machines. Can be controlled by mechanical switches, transistors, or cold-cathode trigger tubes.
Datasheets
Datasheet: Z520M.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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