8025
0 Tubes in archive
BrandRCA
ClassTriode
BaseSmall 4-Pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMicanol
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation40 W
Grid 1 Voltage-260 V
Cathode Current80 mA
Audio Performance
Key Features
- Designed for ultra-high frequencies
- Thoriated-tungsten double-helical filament
- Center-tapped filament to minimize inductance
- Heavy double leads to reduce lead inductance
- Small four-pin base
- Saddle skirted miniature caps
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy (CCS) | 1000V | - | - | 18 | 50mA |
| Class C Telephony (Plate-Modulated ICAS) | 800V | - | - | 18 | 40mA |
| Grid-Modulated R-F Power Amplifier | 1000V | - | - | - | 50mA |
Application Notes
The tube can be operated at maximum ratings up to 500 MHz and at reduced ratings up to 600 MHz. Push-pull operation is recommended for ultra-high frequencies to simplify balancing circuits. Forced-air cooling allows for higher dissipation ratings.
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