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

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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U19 vacuum tube outline illustration

Tube-number record

U19

0 archive entries

U19 is a tube type in the TubeDatabase archive (class: Half-wave Rectifier). Recorded specifications: brand SFA, construction Rectifier, socket 4-pin, and maximum plate voltage 2500 V. The archive does not yet hold a photographed example of this type.

BrandSFA
ClassHalf-wave Rectifier
Base4-pin

Construction

Primary TypeRectifier
Rectifier TypeVacuum
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialOxide coated
Warm-up Time20s

Absolute Maximum Ratings

Application Notes

Recommended for output up to 500mA for a pair of valves in bi-phase circuit. For Peak Inverse Voltage exceeding 5,000V, filament should be switched on at least 20 seconds before anode voltage.

Datasheets

Datasheet: U19.pdf

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

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    Plate Voltage2500 V
    Cathode Current250 mA

    Audio Performance

    Key Features
    • Hard vacuum
    • Directly heated filament
    • Oxide coated filament