GDT120T
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ClassTrigger Tube
BaseB9A
Construction
Primary TypeCold Cathode
EnvelopeGlass
SectionsTrigger tube with integrated priming light diode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Grid 1 Voltage155 V
Cathode Current25 mA
Audio Performance
Key Features
- High current
- Inexpensive trigger tube
- Operation in poor light conditions
- Integrated priming diode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Primed Operation | 315V | - | 8200 | - | 25mA |
Application Notes
Priming diode requires 315 V supply. Light anode connected via 10 MOhm to +315 V, light cathode via 10 MOhm to 0 V. Tubes may exhibit jumps of up to 20 V in operation at low currents.
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