My vast collection of rheostats (https://www.youtube.com/watch?v=-66e-kxP4iM) will finally come in handy! Using a low-ohm one to make a power attenuator box, which is plugged in between a guitar amp and a cabinet, so that you can crank the amp up ...

Living in a post-communist country in central Europe, we don't get that much American tech here - and with USD/EUR to PLN exchange rates, getting Western tech internationally is expensive. I'm mainly limited to getting secondhand (or thirdhand) th...

Long time, no see - it's been a while... Hard to make videos when caught up in the daily grind and life's problems.

An ethically questionable device here is the IBD (Institute of Experimental Biology) TGS-1 electromechanical shock generator. It's...

It's been a while... and it's new gear at Keritech time - with Nixies! This ZOPAN PFL-22 frequency counter / timer is of 1982 vintage, uses eight Z573M tubes as display devices, and all kinds of other indicators: neon lamps, incandescent bulbs and...

It's been a looooong time... and I was thinking about connecting my ThermoNIX digital thermometer from https://www.youtube.com/watch?v=LUIvJlyHlP8 with a recorder to draw a curve of temperature changes over time. This very simple mod adds a voltag...

I recently ordered four 1960s catalogs by Piotr Mikołajczyk, which I was keen on for years, maybe even decades - to grow my collection which previously consisted of two small ones by Leon Niemcewicz that I also show here. Walking you through some,...

I spent the last two weeks in Łódź a.k.a. Boat City, the most post-apocalyptic big city in Poland. I mainly went there to visit my mum, bring back the restored Mazur radio chassis and put it into its proper box, and do some other projects - while ...

This has been a major restoration project in my lab for the last year - and now that I got the whole "cage" a.k.a. arithmetic logic unit, I could finally get the thing working. I learned a lot of stuff on diode & transistor logic, ferrite core mem...

The VISOMAT BWS2 is an obscure '60s East German made device which measures the amount of light using a photocell and advances the wind-up mechanism with an adjustable stop. After the operating dial returns to its neutral position, the exposure lam...

An unusual digital test equipment from the '70s/'80s Poland. Really well made, and just look at all those LC-513 goodness! Reverse-engineered by yours truly, and now I'm walking you through its internals. It's not the only episode I'll have about ...