TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

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)
DisclaimerA–Z indexSubmit a tube
UCH81 vacuum tube outline illustration

Tube-number record

UCH81

0 archive entries

UCH81 is a tube type in the TubeDatabase archive (class: Triode-Heptode). Recorded specifications: brand Philips, construction Multi-section, base Glass, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 1.7 W. The archive does not yet hold a photographed example of this type.

BrandPhilips
ClassTriode-Heptode
BaseNoval (B9A)
Filament19 V @ 100 mA

Construction

Primary TypeMulti-section
EnvelopeGlass
Base MaterialGlass
Sections2

Filament / Heater

Heater NotesIndirect by A.C. or D.C.; series supply

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Heptode section as mixer200 V7751000000—3.7 mA
Heptode section as RF/IF amplifier200 V2400600000—7.6 mA
Triode section characteristics100 V3700—22

Application Notes

Heptode section can be used without special precautions against microphonic effect in circuits where input voltage is >= 50mV for 50mW output.

Datasheets

Datasheet: UCH81.pdf

Download PDF
Loading datasheet...

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

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Plate Voltage250 V
    Plate Dissipation1.7 W
    Grid 2 Voltage250 V
    Grid 1 Voltage-1.3 V
    Cathode Current12.5 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Mixer tube
    • Low microphonic effect
    • Series supply
    • Frequency changer
    13.5 mA
    Triode section as oscillator200 V580——5.4 mA