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AC/PEN

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BrandMazda
ClassOutput Pentode
Base7-pin
Filament4V @ 1mA

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialPlastic or Phenolic
Sections1

Filament / Heater

Heater NotesA.C. Mains

Absolute Maximum Ratings

Plate Voltage250 V
Plate Dissipation8 W
Grid 2 Voltage250 V

Audio Performance

Typical THD5%
Power Output3.3 W
Key Features
  • Output Pentode
  • Self-biased
  • A.C. Mains

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A200V2500--24mA
Class A250V2500--32mA

Application Notes

The valve should always be self-biased, and the bias resistance by-passed by a 50 mfd. condenser. In order to prevent excessive rise of anode load with frequency a condenser resistance filter should be connected across the anode load circuit. The condenser should have a capacity of 0.01 mfd. and the resistance should be about 7,500 Ohms. The grid to cathode resistance should not exceed 1 megohm.

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