Tube-number record
8422
0 archive entries
8422 is a tube type in the TubeDatabase archive (class: Numerical Indicator Tube). Recorded specifications: brand Burroughs Corporation, construction Other / special, base Mica filled phenolic, socket Special / none, and maximum plate voltage 170 V. The archive does not yet hold a photographed example of this type.
BrandBurroughs Corporation
ClassNumerical Indicator Tube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeRectangular
Base MaterialMica filled phenolic
SectionsCommon anode, ten metallic cathodes (0-9)
Filament / Heater
Absolute Maximum Ratings
Plate Voltage170 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Test Condition 1 | 170 V | — | 8200 | — | 2.25 mA |
| Test Condition 2 | 200 V | — | 22000 | — | — |
| Test Condition 3 | 250 V | — | 47000 | — | — |
Application Notes
The minimum supply voltage should be 170 volts. However, the use of highest available voltage with the appropriate series resistor is recommended to maintain cathode current within the specified limits. A supply voltage of 200 volts or more is recommended to assure proper operation at the temperature extremes. The center line of the numbers to be displayed passes through pins 6 and 12 of the tube. The tube socket should be oriented so that pins 6 and 12 are in a vertical line with pin 12 at the top.
Datasheets
Datasheet: 8422.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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