4CM4
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BrandTelefunken
ClassTriode
Base9-pin Noval
Filament3.8V @ 300mA
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 | 175V | 14000 | - | 68 | 12mA |
Application Notes
Specifically designed for grounded-grid amplifier operation up to UHF frequencies.
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