Hoefer PS500XT Lab PSU

Modifying an electrophoresis generator for lab usage Hoefer PS500XT – Electrophoresis HV power supply modified for tube lab purpose. 500V at 400mA should suffice for many circuit developments. Changes : replace the large on/off/timer switch by an isolated, quick-to-operate, safe switch added a fan on the back, outside of the Read more…

Capacitor holder

how to fix Motor Run Caps Several tube amplifiers use motor run caps nowadays. These high-voltage capacitors come in large cans. The one on the picture below is 150mm long and 55mm in diameter. I do not like these monsters protruding through an amplifier top-plate, so I hide them inside Read more…