UCH 4
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ClassTriode-heptode
BaseSide-contact (P-base)
Filament20V @ 100mA
Construction
Primary TypeTriode-Heptode
EnvelopeGlass
Base MaterialMetal/Glass
Sections2
Filament / Heater
Heater NotesIndirect heating; AC or DC series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Key Features
- Combined MF/LF amplifier
- Phase inverter
- Separated triode and heptode grid 3
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode as Mixer (100V) | 100V | 600 | 1000000 | - | 1.5mA |
| Heptode as Mixer (200V) | 200V | 750 | 1300000 | - | 3mA |
| Triode Section (Static) | 100V | 3200 | - | 22 | 12mA |
Application Notes
The triode grid and the third grid of the heptode section are separately led out to the base, offering multiple application possibilities including frequency conversion and phase inversion.
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