PL81A
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BrandMullard
ClassLine output pentode
BaseB9A
Filament21.5V @ 300mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSuitable for series operation a.c. or d.c.
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation8 W
Grid 2 Voltage250 V
Grid 1 Voltage-120 V
Cathode Current180 mA
H-C Voltage200 V
Audio Performance
Key Features
- Series operation
- Portable television receivers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 170V | 6500 | 11500 | 4.9 | 45mA |
Application Notes
Operation so that the anode potential of the output valve at the end of the scan is above the knee of the anode characteristic is recommended.
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