Tube-number record
4CM4
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BrandTelefunken
ClassTriode
BaseNoval (B9A)
Filament3.8 V @ 300 mA
Construction
Primary TypeTriode
EnvelopeT 6 1/2
SectionsSingle
Filament / Heater
Heater Notesac or dc
Absolute Maximum Ratings
Plate Voltage220 V
Plate Dissipation2.2 W
Grid 1 Voltage-50 V
Cathode Current20 mA
H-C Voltage100 V
Audio Performance
Key Features
- Coated unipotential cathode
- Grounded-grid amplifier application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| grounded-grid amplifier | 175 V | 14000 | — | 68 | 12 mA |
Application Notes
Specifically designed for grounded-grid amplifier operation up to UHF frequencies.
Datasheets
Datasheet: 4CM4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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