Tube-number record
UCH 21
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UCH 21 is a tube type in the TubeDatabase archive (class: Triode-Heptode). Recorded specifications: construction Multi-section, base Metal/Glass Loctal, socket Loctal, 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
BaseLoctal
Filament20 V @ 0.1 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialMetal/Glass Loctal
Sections2
Filament / Heater
Heater NotesIndirect heating, AC/DC series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1.5 W
Grid 2 Voltage100 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Typical THD2.4%
Key Features
- Common cathode
- Internal shield
- Separate Triode and Heptode control grids
- Suitable for AC/DC sets
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode as Mixer (200V) | 200 V | 750 | 1000000 | — | 3.5 mA |
| Heptode as Mixer (100V) | 100 V | 580 | 1000000 | — | 1.5 mA |
| Heptode as IF Amp (200V) | 200 V | 2200 | 700000 | — | 5.2 mA |
| Triode Static | 100 V | 3200 | 5937.5 | 19 | 12 mA |
Application Notes
The UCH 21 is similar to ECH 21 but with different heater ratings. Used as mixer, IF amplifier, or AF amplifier and phase inverter.
Datasheets
Datasheet: UCH21.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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