|4-500A is a compact, ruggedly constructed, broadcast-quality tetrode having a maximum plate dissipation rating of 500 watts. It is intended for use as an amplifier, oscillator, or modulator. The low grid-plate capacitance of this tetrode coupled with its low driving-power requirement allows considerable simplification of the associated circuit and driver stage.
The 4-500A is cooled by radiation from the plate and by circulation of forced-air through the base, around the envelope, and over the plate seal. Cooling can be greatly simplified by using an Air-System Socket, and its accompanying glass chimney. This socket is designed to maintain the correct balance of cooling air between the component parts of the tube.
The 4-500A is especially recommended for applications where long life and consistent performance are of prime consideration.
Current, at 10.0 volts
10.0 ± 0.5 V
|Amplification Factor (Average)
Grid to Screen
|Direct Interelectrode Capacitances (grounded filament)
|Frequency of Maximum Rating
|Maximum Overall Dimensions
7.000 in; 177.80 mm
3.562 in; 90.47 mm
|Net Weight||8.7 oz; 245 gm|
|Operating Position||Vertical, base up or down|
|Maximum Operating Temperature
|Cooling||Radiation and forced air|
|Recommended Heat-Dissipating Connectors
|Specifications may change without notice|
|THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS|
|Manufacturer||Transmitter specifications||Power in kW|
|THIS TUBE IS AVAILABLE FROM|
|PRICE LEVEL (US$)|
|0 - 10||10 - 100||100 - 1000||1000 - 10,000||10,000 - 50,000||50,000 - 100,000|