The VK4YE 1 Kilowatt Linear Amplifier.
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Mounting & Cooling Of Tubes.
The 813 tubes can be mounted upright or horizontally with pins 1 and 6 in the vertical plane. Horizontal mounting has the advantage that you can build the amplifier into a low profile box perhaps no higher than 175mm. It certainly looks more modern and compatible with solid state rigs.
While the 813 operates as a natural convection/radiation cooled tube, I would recommend the use of a computer fan to assist cooling. If the tubes are to be mounted horizontally, the fan can be mounted beneath the tubes blowing air up past them. Consider using a fan to remove heat from the power supply as well.
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