Tube-number record
E 444
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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
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Resistance coupled, Vg2=33V | 200 V | 3000 | 2500000 | 1000 | 0.35 mA |
| Resistance coupled, Vg2=45V | 200 V | — | 1000000 | 800 | 0.9 mA |
Application Notes
Specifically designed for diode rectification followed by AF (LF) amplification.
Datasheets
Datasheet: E444.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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