HT 351
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BrandVEB Werk für Fernsehelektronik Berlin
ClassUHF Triode
Filament12.6V @ 2.1mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time120s
Heater NotesHeater voltage must be reduced for frequencies above 300 MHz.
Absolute Maximum Ratings
Plate Voltage1100 V
Plate Dissipation350 W
Cathode Current300 mA
Audio Performance
Key Features
- Metal-Ceramic construction
- Air cooled
- UHF operation up to 3.75 GHz (Pulse)
- UHF operation up to 1.7 GHz (CW)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Values | 1300V | 23000 | 2870 | 66 | 150mA |
| CW Oscillator at 1.67 GHz | 1050V | - | - | - | 300mA |
| Pulse Oscillator at 3.3 GHz | 9000V | - | - | - | 7500mA |
Application Notes
Recommended heater voltage reduction: 300-600 MHz: 12.0 V, 600-900 MHz: 11.0 V, 900-1200 MHz: 10.0 V, 1200-1600 MHz: 9.0 V, >1600 MHz: 8.0 V. Only for maintenance/replacement purposes.
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