HT 321
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BrandVEB Werk für Fernsehelektronik-Berlin
ClassHöchstfrequenztriode
BaseConcentric electrodes
Filament12.6V @ 1.1mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
SectionsSingle
Filament / Heater
Warm-up Time120s
Heater NotesHeater voltage must be reduced for frequencies above 400 MHz: 12.1V (400-1000 MHz), 11.5V (1000-2000 MHz), 10.8V (>2000 MHz).
Absolute Maximum Ratings
Plate Voltage2000 V
Grid 1 Voltage-300 V
Cathode Current125 mA
Audio Performance
Power Output40 W
Key Features
- Metal-ceramic technology
- Concentric electrode connections
- Air-cooled
- UHF operation up to 3.75 GHz
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static | 1300V | 23000 | - | 110 | 100mA |
| Oscillator (1.66 GHz) | 600V | - | - | - | 100mA |
Application Notes
The HT 321 is an air-cooled UHF triode in metal-ceramic design. It is now only supplied for equipment maintenance (Nachbestückung). Adequate cooling airflow is required at maximum plate dissipation.
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