On 11 Apr, 2008, at 18:00, cctalk-request at classiccmp.org wrote: Good idea, thanks for that. Last time I poked around in one of my 1301's PSUs it was seven feet up in the air and I jiggled the stabiliser rack and the -22.6v, quarter inch bus bar touched the frame, showering me with sparks and burning a notch into the angle iron frame :-) Its not just AC that's dangerous on big iron. Over the years I've been bitten many times by 240v and no ill effects but I get very careful when near the three phase 440v supply, or near car H.T. leads or any thermionic valves, especially CRTs. Roger Holmes.