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

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DL 21 vacuum tube outline illustration

Tube-number record

DL 21

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DL 21 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Philips, construction Pentode, base Metal/Glass, socket Loctal, maximum plate voltage 135 V, and maximum plate dissipation 0.7 W. The archive does not yet hold a photographed example of this type.

BrandPhilips
ClassOutput Pentode
BaseLoctal

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Glass
Sections1

Filament / Heater

MaterialDirectly Heated

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Single-ended Class A90 V1300300000—4 mA
Single-ended Class A120 V1400350000—5 mA

Application Notes

The DL 21 is designed for use as an output tube in battery-operated receivers with very low filament current. To avoid hum in series filament circuits, place the DL 21 at the negative end of the chain.

Datasheets

Datasheet: DL21.pdf

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

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    Plate Voltage
    135 V
    Plate Dissipation0.7 W
    Grid 2 Voltage135 V
    Cathode Current7 mA

    Audio Performance

    Typical THD10%
    Power Output0.26 W
    Key Features
    • Battery operated
    • Low filament current
    • High efficiency (47%)