UCH 21
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ClassTriode-Heptode
BaseLoctal (Y8A)
Filament20V @ 0.1mA
Construction
Primary TypeTriode-Heptode
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) | 200V | 750 | 1000000 | - | 3.5mA |
| Heptode as Mixer (100V) | 100V | 580 | 1000000 | - | 1.5mA |
| Heptode as IF Amp (200V) | 200V | 2200 | 700000 | - | 5.2mA |
| Triode Static | 100V | 3200 | 5937.5 | 19 | 12mA |
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.
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