Tube-number record
C-327
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BrandCunningham
ClassGeneral Purpose Triode
Base5-pin
Filament2.5 V @ 1750 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesAlternating current operation
Absolute Maximum Ratings
Plate Voltage180 V
Audio Performance
Key Features
- Permits operation from alternating current
- Detector or Amplifier use
- Heater element design
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Detector | 45 V | — | — | — | — |
| Amplifier | 90 V | — | — | — | — |
| Amplifier | 135 V | — | — | — | — |
| Power Amplifier | 180 V | — | — | — | — |
Application Notes
In some circuits, biasing of the heater approximately 9 volts negative with respect to the cathode may be beneficial for best operation. A heater/cathode bias higher than 9 volts is not recommended.
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