Tube-number record
UCH 4
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UCH 4 is a tube type in the TubeDatabase archive (class: Triode-heptode). Recorded specifications: construction Multi-section, base Metal/Glass, socket Side-contact (P-base), maximum plate voltage 250 V, and maximum plate dissipation 1.5 W. The archive does not yet hold a photographed example of this type.
ClassTriode-heptode
BaseSide-contact (P-base)
Filament20 V @ 100 mA
Construction
Primary TypeMulti-section
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) | 100 V | 600 | 1000000 | — | 1.5 mA |
| Heptode as Mixer (200V) | 200 V | 750 | 1300000 | — | 3 mA |
| Triode Section (Static) | 100 V | 3200 | — | 22 | 12 mA |
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.
Datasheets
Datasheet: UCH4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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