Tube-number record
ML 4
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ML 4 is a tube type in the TubeDatabase archive (class: Audio Power Triode). Recorded specifications: brand Marconi, construction Triode, maximum plate voltage 200 V, and maximum plate dissipation 5 W. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassAudio Power Triode
Filament4 V @ 1 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesA.C. Mains Valve
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation5 W
Audio Performance
Key Features
- low magnification
- low impedance
- high conductance
- A.C. Mains
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 100 V | — | — | — | 12 mA |
| Typical | 150 V | — | — | — | 18 mA |
| Typical | 200 V | — | — | — | 25 mA |
| Characteristics at Ea 100, Eg 0 | 100 V | 4200 | 2860 | 12 | — |
Application Notes
Small output valve, initial L.F. amplifier, or oscillator. The high conductance provides considerable stage gain. Output is sufficient for average domestic volume with a moving iron speaker.
Datasheets
Datasheet: ML4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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