![]() ![]() I have not yet found the exact circuit in any of the ham radio magazines. An understanding of the circuit is a must. Also, lethal high voltage (Over 2500 volts DC) is present on top of the chassis as well as under when a high voltage power supply is connected.Due care and caution are warranted. I have limited experience with transmitters and RF amplifiers so tend to err on the side of caution. As can be seen, the 813 tubes glow quite brightly with the filaments powered (10 volts at 10 amps). The piece has a filament transformer mounted under the chassis. I did not have a high voltage power supply for it so had to build one (more info on power supply below). I originally bought the piece at auction because of the rack-mount cabinet in which it was installed but became intrigued by what seems to be a relatively simple circuit, a parallel wired pair of 813 tubes in a grounded-grid configuration. I am assuming it to be about 35 to 40 years old. This home-brew amp with two 813 tubes for the final was made by an unknown amateur radio operator (ham) some years ago. Old 813 homebrew Amp 813 Homebrew Amp with Power Supply from recycled parts. ![]()
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May 2023
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