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(Not written by me)

813 Homebrew Amp with Power Supply from recycled parts.

This home-brew amp with two 813 tubes for the final was made by an unknown amateur radio operator (ham) some years ago. I am assuming it to be about 35 to 40 years old. 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 did not have a high voltage power supply for it so had to build one (more info on power supply below). The piece has a filament transformer mounted under the chassis. As can be seen, the 813 tubes glow quite brightly with the filaments powered (10 volts at 10 amps).

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H-820 6-Axis Positioner with Controller
Cost-Efficient Hexapod

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8/22. The day last year when I was working at the zoo and one of the interns relived me from my station 30 minutes late, during which I panicked.
 
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