D-shell connector age?

Interesting. There were sets over here (made by a company called Salora, I think) that had what was commanly known as the IPSALO circuit. That was an acronym for 'Integrated Power Supply and Line Output' (Line Output being what we call the Horizontal Output stage). IIRC, the horizontal yoke was on the live side of the power supply, the vertical yoke (and in fact the entire vertical deflection circuit) was on the isolated side. Hmmm.. Never seen that, Sure. And, indeed, for working on any SMPSU (which are common in classic computers, and therefore on-topic). I think I've mentioend the origianl Tandy Model 1 monitor before, but it's worth doing so again. it was based (as is well-known) on an RCA protable TV, the tuner and IF boards were removed and the latter replaced by a composite video input board. That TV was live chassis. US versions have a on opto-isolater on the video input board (that's the reason for the 5V power output on the model 1's video DIN socket, to power the input side of the opto-isolator circuit), every thing else inide the monitor is live!. European models have a step-down _isolating_ transformer inside the case (since the TV chassis was designed for 115V mains input only), the video input board is then little more than a transistor buffer stage. Of course with that version almost all the circuitry inside the monitor is isolated from the power line. But be _very_ careful if you work on the US version! -tony