Tube-number record
4CX7
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BrandSYLVANIA
ClassMiniature medium mu twin triodes
BaseNoval (B9A)
Filament4.2 V @ 600 mA
Construction
Primary TypeDual triode
EnvelopeT6 1/2
Sections2
Filament / Heater
Heater NotesControlled heater warm-up time for series heater strings
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Controlled heater warm-up time
- Cascode (vhf) amplifiers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 150 V | 6400 | — | 39 | 9 mA |
Application Notes
Designed for operation as cascode (vhf) amplifiers. Under cutoff conditions in cascode amplifiers, plate voltage rating may be as high as 300 volts.
Datasheets
Datasheet: 4CX7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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