898-A
0 Tubes in archive
BrandRCA
ClassTransmitting Triode
BaseNo.6628
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMetal with Nozzle
Sections1
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage20000 V
Plate Dissipation100000 W
Grid 1 Voltage-3000 V
Cathode Current10000 mA
Audio Performance
Power Output90000 W
Key Features
- Water-cooled plate
- Three-section tungsten filament
- Forced-air cooled filament seal
- High power output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy | 18000V | - | - | 45 | 8330mA |
| Class B Audio (Two Tubes) | 12000V | - | 2000 | - | 13000mA |
| Class C Telephony | 12000V | - | - | - | 5000mA |
Application Notes
Requires water flow of 15 to 25 gallons per minute. Air flow of 15 CFM in bulb nozzle and 3 CFM in filament-seal nozzle is required before applying voltages.
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