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

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Tube-number record

E 444

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E 444 is a tube type in the TubeDatabase archive (class: Binode (Diode-Pentode)). Recorded specifications: brand Philips Miniwatt, construction Indirectly heated, base Metal/Phenolic, socket CRT / special base, maximum plate voltage 250 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.

BrandPhilips Miniwatt
ClassBinode (Diode-Pentode)
BaseCRT / special base
Filament4 V @ 1100 mA

Construction

Primary TypeIndirectly heated
EnvelopeGlass
Base MaterialMetal/Phenolic
SectionsDiode-Pentode

Filament / Heater

Heater NotesIndirect heating

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Resistance coupled, Vg2=33V200 V3000250000010000.35 mA
Resistance coupled, Vg2=45V200 V—10000008000.9 mA

Application Notes

Specifically designed for diode rectification followed by AF (LF) amplification.

Datasheets

Datasheet: E444.pdf

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

Filters

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Manufacturers

Brands

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    Plate Voltage250 V
    Plate Dissipation1 W
    Grid 2 Voltage150 V
    Grid 1 Voltage-1.3 V
    Cathode Current10 mA
    H-C Voltage50 V

    Audio Performance

    Key Features
    • Low anode-grid capacitance
    • High amplification factor
    • Combined diode for rectification