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27SP4 vacuum tube outline illustration

Tube-number record

27SP4

0 archive entries

27SP4 is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand Sylvania, construction Rectangular Glass, socket Duodecal, and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassTelevision Picture Tube
BaseDuodecal
Filament6.3 V @ 600 mA

Construction

Primary TypeRectangular Glass
EnvelopeJ1-21 Recessed Small Cavity Cap
SectionsSingle

Filament / Heater

Heater Notes0.6 Ampere

Absolute Maximum Ratings

Plate Voltage20000 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Recommended Operating Conditions18000 V————

Application Notes

External conductive coating must be grounded. Brilliance and definition decrease with decreasing anode voltage. X-ray radiation shielding may be necessary if operated higher than 16,000 volts.

Datasheets

Datasheet: 27SP4.pdf

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

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    Grid 2 Voltage500 V
    Grid 1 Voltage-125 V
    H-C Voltage180 V

    Audio Performance

    Key Features
    • 27” Direct Viewed
    • Rectangular Glass Type
    • Spherical Faceplate
    • Gray Filter Glass
    • Magnetic Deflection
    • Electrostatic Focus
    • Single Field Ion Trap
    • Aluminized Screen
    • External Conductive Coating