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

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4CX7 vacuum tube outline illustration

Tube-number record

4CX7

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4CX7 is a tube type in the TubeDatabase archive (class: Miniature medium mu twin triodes). Recorded specifications: brand SYLVANIA, construction Dual triode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.

BrandSYLVANIA
ClassMiniature medium mu twin triodes
Base
Noval (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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier150 V6400—399 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

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

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