Tube-number record
UCH81
0 archive entries
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
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode section as mixer | 200 V | 775 | 1000000 | — | 3.7 mA |
| Heptode section as RF/IF amplifier | 200 V | 2400 | 600000 | — | 7.6 mA |
| Triode section characteristics | 100 V | 3700 | — | 22 | 13.5 mA |
| Triode section as oscillator | 200 V | 580 | — | — | 5.4 mA |
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 PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results