Tube-number record
DIRECTLY HEATED PENTODE
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BrandCossor
ClassOutput Pentode
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation12 W
Grid 2 Voltage300 V
Grid 1 Voltage-40 V
Audio Performance
Key Features
- Directly heated
- Heavy duty
- High efficiency
- High voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Output Stage | 400 V | 2250 | 8000 | — | 30 mA |
Application Notes
A stage of low frequency amplification will be necessary to precede this valve, as an input of approximately 40 volts peak is required for full output.
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