PL 81
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BrandLa Radiotechnique
ClassPentode
BaseNoval
Filament21.5V @ 0.3mA
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirect heating, series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation8 W
Grid 2 Voltage250 V
Grid 1 Voltage-50 V
Cathode Current180 mA
H-C Voltage200 V
Audio Performance
Typical THD5.2%
Power Output20 W
Key Features
- Television sound output
- Line timebase amplifier
- High peak anode voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Nominal | 170V | 6200 | 10000 | - | 45mA |
| Nominal 2 | 200V | 6000 | 11000 | - | 40mA |
| Push-Pull Class B | 170V | - | - | - | 146mA |
Application Notes
Peak anode voltage of 7000V max for pulse duration of 18% of the period. Grid 2 dissipation up to 6W during cathode warmup.
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