Tube-number record
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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. Amplifier | 250 V | 1400 | 3500000 | — | 2 mA |
| Anode Detector | 250 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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