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Tube Database (7,341 tube types · 1,270 archive entries)

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MH40 vacuum tube outline illustration

Tube-number record

MH40

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MH40 is a tube type in the TubeDatabase archive (class: Low Noise Level Triode). Recorded specifications: brand Marconi, construction Triode, socket 5-pin, and maximum plate voltage 200 V. The archive does not yet hold a photographed example of this type.

BrandMarconi
ClassLow Noise Level Triode
Base5-pin

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage200 V

Audio Performance

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical—25001800045—

Application Notes

Intended for early stages of high gain amplifiers. Operate with the lowest anode current possible consistent with the gain required. Supplied in clear glass only.

Datasheets

Datasheet: MH40.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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    Key Features
    • Low noise level
    • Rigid electrode system
    • Special steatite insulators
    • Low microphony
    • Theoretical shot noise limit