UCH81
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BrandPhilips
ClassTriode-Heptode
BaseNoval
Filament19V @ 100mA
Construction
Primary TypeTriode-Heptode
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 | 200V | 775 | 1000000 | - | 3.7mA |
| Heptode section as RF/IF amplifier | 200V | 2400 | 600000 | - | 7.6mA |
| Triode section characteristics | 100V | 3700 | - | 22 | 13.5mA |
| Triode section as oscillator | 200V | 580 | - | - | 5.4mA |
Application Notes
Heptode section can be used without special precautions against microphonic effect in circuits where input voltage is >= 50mV for 50mW output.
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