Tube-number record
MHD4
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MHD4 is a tube type in the TubeDatabase archive (class: Double Diode Triode). Recorded specifications: brand Marconi, construction Multi-section, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassDouble Diode Triode
Base7-pin (non-miniature)
Filament4 V @ 1 mA
Construction
Primary TypeMulti-section
EnvelopeMetallised
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Detection
- A.V.C.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RC Coupled | 350 V | — | 50000 | — | 4 mA |
| RC Coupled | 250 V | — | 50000 | — | 3.2 mA |
| RC Coupled | 250 V | — | 50000 | — | 2.8 mA |
Application Notes
Intended for detection, A.V.C. and L.F. amplification in straight or super-het receivers. Allows good gain with R.C. coupling; transformer coupling also suitable.
Datasheets
Datasheet: MHD4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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