Tube-number record
PEN40DD
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BrandMullard
ClassDouble Diode Output Pentode
Base7-pin (non-miniature)
Filament4 V @ 1.9 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsDouble Diode Output Pentode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation10 W
Grid 2 Voltage250 V
H-C Voltage175 V
Audio Performance
Key Features
- Double diode for detection
- Output pentode for power amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 200 V | 8000 | — | — | 45 mA |
Application Notes
Commonly used as a combined detector, AVC, and output stage in radio receivers.
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