• This is currently making my lab at work a bit toasty. It's a Maplin Millennium 4-20 that I first built in 1996. Rebuilt it at some point with an uprated mains transformer and some improved internal cabling and a new set of EL34s, but it started playing up and has sat in the loft for the last 10 years. Been spending some lunchtimes checking it over and making some improvements like correctly isolating the mains transformer and making up some dummy loads. Got it ready to fire up this lunchtime and it's been sitting on the bench doing a couple of hours burn-in. Everything good so far. Now it's all working satisfactorily I'll have to have a think about what to do with the case.

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