[turretslug]

It's a shame the previous owner hadn't put a bit more effort into making a couth job of what was presumably a well-intentioned impulse to make an expensive possession safer. I ran my 670A from an external 1:1 mains isolating transformer for a long time but in the end decided to make it a self-contained and unambiguously Class 1 device with metal (1/8" aluminium) rear apron and internal mains transformer. A step I had ummed and aahed about for some time, finding a big lucky dip box of valves at a vintage event that included lots of EAF42s for 10p each was the clincher.