GR 20
0 Tubes in archive
ClassCold Cathode Relay Tube
BaseNoval
Construction
Primary TypeGlow Triode
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 | 220V | - | 20000 | - | 6mA |
Application Notes
Counting circuits for addition and subtraction. Similar to GR 15 but with two starters.
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