Tube-number record
PL 81
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PL 81 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand La Radiotechnique, year 1956, construction Pentode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 8 W. The archive does not yet hold a photographed example of this type.
BrandLa Radiotechnique
ClassPentode
BaseNoval (B9A)
Filament21.5 V @ 0.3 mA
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 | 170 V | 6200 | 10000 | — | 45 mA |
| Nominal 2 | 200 V | 6000 | 11000 | — | 40 mA |
| Push-Pull Class B | 170 V | — | — | — | 146 mA |
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.
Datasheets
Datasheet: PL81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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