Tube-number record
GR 20
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GR 20 is a tube type in the TubeDatabase archive (class: Cold Cathode Relay Tube). Recorded specifications: construction Triode, socket Noval (B9A), and maximum plate voltage 270 V. The archive does not yet hold a photographed example of this type.
ClassCold Cathode Relay Tube
BaseNoval (B9A)
Construction
Primary TypeTriode
EnvelopeGlass
SectionsTriode with 2 starters
Filament / Heater
Absolute Maximum Ratings
Plate Voltage270 V
Grid 1 Voltage140 V
Cathode Current30 mA
Audio Performance
Key Features
- 2 starter electrodes
- Cold cathode
- Low minimum cathode current
- Mounting in any position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| DC typical operation | 220 V | — | 20000 | — | 6 mA |
Application Notes
Counting circuits for addition and subtraction. Similar to GR 15 but with two starters.
Datasheets
Datasheet: GR20.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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