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Tube Database (7,341 tube types · 1,270 archive entries)

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ACORN PENTODE

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BrandMullard
ClassPentode
BaseAcorn
Filament4 V @ 1 mA

Construction

Primary TypePentode
EnvelopeAcorn
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage250 V
Grid 2 Voltage100 V
Grid 1 Voltage-1.5 V
Cathode Current4 mA
H-C Voltage50 V

Audio Performance

Key Features
  • Ultra high frequency operation
  • Acorn type
  • Low capacitances

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
R.F. Amplifier250 V14003500000—2 mA
Anode Detector250 V—250000—0.1 mA

Application Notes

The AP4 is an Acorn type specially designed for operation at ultra high frequencies up to 430 Mc. Use necessitates special precautions in circuit design: earth return leads must be kept short and commoned in the cathode circuit.

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