QP 240
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BrandMazda
ClassBattery Double Pentode Output Valve
Base9-pin
Construction
Primary TypePentode
EnvelopeGlass
SectionsDouble
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Grid 2 Voltage150 V
Audio Performance
Key Features
- Quiescent Push-pull
- Individually matched sections
- Battery receivers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Quiescent Push-Pull | 100V | 4000 | - | - | - |
| Quiescent Push-Pull | 135V | - | 16000 | - | 3.3mA |
Application Notes
All symmetrical push-pull circuits are liable to generate parasitic oscillation. This can be avoided by connecting resistances up to 50,000 ohms in series with the pentode grids close to the valve pins or, alternatively, by connecting condensers 0.001 mf. capacity between the anodes and filament.
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