Tube-number record
42 M.P./PEN.
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42 M.P./PEN. is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Cossor, construction Pentode, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandCossor
ClassOutput Pentode
Filament4 V @ 2 mA
Construction
Primary TypePentode
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- High slope
- Pentode output valve
- Capable of very large undistorted volume
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 250 V | 7000 | — | — | 32 mA |
| Class A | 200 V | — | — | — | 28 mA |
Application Notes
Characterised by an exceptionally high slope, which enables it to deliver full output for a very small input. May be fed directly from a double diode detector such as the Cossor D.D.4.
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