Burroughs C 3207 Vintage Calculator

Well I just fin­ished work­ing on the APF Mark 1 cal­cu­la­tor so I was­n’t look­ing for anoth­er cal­cu­la­tor project right away, but I stum­bled upon this Burroughs C 3207 cal­cu­la­tor with sev­er­al issues for a price that was too good to pass up. And it’s a vin­tage 14 dig­it Nixie tube cal­cu­la­tor Built in late 1969.

Burroughs C 3207 Nixie tube cal­cu­la­tor after clean­ing and repairs
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Keithley 2015 THD Multimeter maintenance

I have had my used Keithley 2015 THD mul­ti­me­ter for just over six years now, and have final­ly decid­ed to per­form some main­te­nance on it. I pur­chased it as a ful­ly test­ed and work­ing unit back in 2016. After it arrived, I did a visu­al check of inter­nal com­po­nents and a good clean­ing of the exterior.

Keithley 2015 THD mul­ti­me­ter, 10 volt input — warmup
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Power Designs D‑series display board update

After the acqui­si­tion of my Power Designs 5015D pow­er sup­ply, I real­ly want­ed to upgrade the dis­play mod­ule so that I had an extra dig­it of res­o­lu­tion. I already had a few ADC/LED meter boards left over from pre­vi­ous projects, but need­ed a dis­play board to pair with it.

Power Designs D‑series dis­play board Rev. 2.4
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Power Designs Inc. 5015D power supply cleanup and repair

Repair and cleanup of a Power Designs Inc. 5015D pow­er sup­ply that I pur­chased on Ebay.
This was one of the bet­ter look­ing 5015D pow­er sup­plies that I have seen on Ebay, that was not over­priced or includ­ed an over­priced ship­ping charge. The list­ings con­di­tion descrip­tion said ” ful­ly oper­a­tional and func­tions as intended”.

Power Designs Inc. 5015D front pan­el after cleanup and dis­play mod.
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