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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Nominal170V620010000-45mA
Nominal 2200V600011000-40mA
Push-Pull Class B170V---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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