Tube-number record
8422
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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
Cathode Current3.5 mA
Audio Performance
Key Features
- Ultra Long Life
- Rectangular shape
- Direct in-line readout
- Side by side stacking
- Gas-filled
- Cold-cathode
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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