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

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EL 51 vacuum tube outline illustration

Tube-number record

EL 51

0 archive entries

EL 51 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Philips, construction Pentode, socket Side-contact (P-base), maximum plate voltage 750 V, and maximum plate dissipation 45 W. The archive does not yet hold a photographed example of this type.

BrandPhilips
ClassOutput Pentode
BaseSide-contact (P-base)
Filament6.3 V @ 1900 mA

Construction

Primary TypePentode
SectionsSingle

Filament / Heater

Heater NotesIndirect heating by A.C. or D.C.; parallel supply

Absolute Maximum Ratings

Plate Voltage750 V
Plate Dissipation45 W

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Characteristic 1500 V140003300016.587 mA
Typical Characteristic 2750 V80005000016.560 mA
Class B Push-Pull750 V———145 mA

Application Notes

Suitable for Class B and Class AB push-pull audio output stages.

Datasheets

Datasheet: EL51.pdf

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

Filters

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Manufacturers

Brands

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    Grid 2 Voltage750 V
    Grid 1 Voltage-1.3 V
    Cathode Current200 mA
    H-C Voltage50 V

    Audio Performance

    Typical THD5%
    Power Output140 W
    Key Features
    • Indirectly heated
    • High power output
    • Side-contact base
    Class AB Push-Pull500 V———110 mA