Tube-number record
PEN40DD
0 archive entries
PEN40DD is a tube type in the TubeDatabase archive (class: Double Diode Output Pentode). Recorded specifications: brand Mullard, construction Pentode, socket 7-pin (non-miniature), maximum plate voltage 250 V, and maximum plate dissipation 10 W. The archive does not yet hold a photographed example of this type.
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
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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