4C21
0 Tubes in archive
BrandGeneral Electric
ClassGeneral Purpose Triode
BaseJumbo 4 large pin
Construction
Primary Typetriode
EnvelopeT-18
Sectionssingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation100 W
Grid 1 Voltage-400 V
Cathode Current175 mA
Audio Performance
Typical THD5%
Power Output19.7 W
Key Features
- General Purpose
- Air cooled
- Vertical mounting only
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A A-F Amplifier | 1250V | 3600 | 3600 | 12 | 60mA |
| Class B A-F Power Amplifier (per tube) | 1250V | - | - | - | 520mA |
| Class C R-F Power Amplifier | 1250V | - | - | - | 150mA |
Application Notes
The normal value of grid leak for Class C operation is approximately 5000 ohms. If self-bias is used, cathode resistor should be approximately 1000 ohms. Ventilation of bulb required at high frequencies.
Datasheet Viewer
Loading datasheet...
Sort by
Showing 1 to 0 of 0 results