8025-A
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BrandRCA
ClassU-H-F Transmitting Triode
BaseSmall 4-Pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMicanol
SectionsSingle
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation40 W
Grid 1 Voltage-200 V
Cathode Current80 mA
Audio Performance
Key Features
- High perveance
- Low transit time
- Thoriated-tungsten filament
- Double-helical filament
- Center-tapped filament
- Forced-air cooling capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy | 1000V | - | - | 18 | 50mA |
| Plate-Modulated Class C Telephony | 800V | - | - | 18 | 40mA |
| Grid-Modulated Class C Telephony | 1000V | - | - | 18 | 50mA |
Application Notes
Designed for use at ultra-high frequencies up to 500 MHz at full ratings. The center-tapped filament arrangement minimizes lead inductance effects.
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