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

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Tube-number record

CL33

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BrandMullard
ClassOutput Pentode
BaseOctal
Filament33 V @ 200 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage250 V
Plate Dissipation9 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current70 mA
H-C Voltage175 V

Audio Performance

Typical THD10%
Power Output4 W
Key Features
  • High-sensitivity
  • DC/AC mains-operated

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A200 V90003500013.545 mA

Datasheets

Datasheet: CL33.pdf

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

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