TD2-500A
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BrandMullard
ClassTransmitting Triode
BaseDisc Seal
Construction
Primary TypeTriode
EnvelopeCeramic
Base MaterialMetal/Ceramic
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage2700 V
Plate Dissipation500 W
Grid 1 Voltage-300 V
Cathode Current575 mA
Audio Performance
Power Output580 W
Key Features
- Disc seal
- Ceramic envelope
- Forced-air cooled
- Grounded grid operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy (400 Mc/s) | 2500V | 14000 | 5000 | 70 | 380mA |
| Class C Telegraphy (625 Mc/s) | 2200V | 14000 | 5000 | 70 | 380mA |
Application Notes
At frequencies higher than 600Mc/s, filament voltage must be reduced (to 3.3V or 3.2V) to compensate for back bombardment heating of the cathode.
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