Smoke From PSU Socket

I have now dione what I should have done ages ago amnd looked at the DELNI printset on bitsavers (under dec/ethernet IIRC) [1]. I find that the printset is always the best manual to look at first :-) [1] As you all know by now, looking at on-line documentation is rather more work for me than for most people, which is why I didn't instnatly look at bitsavcers to see if there was anything useful. Anyway, I was somewhat suprised by the PSU. It's not an SMPSU. At least one of the regulators looks to be a switching type,, but the power supply starts with a mains transformer (running at 50Hz or 60Hz). The primary windings of that transformer go to the nromal series/parallel switch and then to the mains input. Oh yes, there's a fuse in series with the live wire. Now, 10A, even at 110V is over 1kW. a 1kW (more correctly 1kVA) trransformer is a big lump of iron. I doubt one would fit in the DELNI case. So I am sure a 10A filter will be fine. When you replace it, make sure that the wire that goes to one end of the fuseholder goes to the live output tag on the filter. It's very clear [Modifying the case] Well, agreed, I'd rather mont have to do it, but it's better to slightly enlarge the hole than have a non-working device, isn't it? I think it will, these things come in fairly standard sizes. Admittedly it was just an IEC320 plug, not one with a built-in filter, but I found a generic plug from the local electroncis shop was a perfect fit as a replacement for a broken one in an HP9820 calcluator made over 25 years earlier. No cutting, filing or drilling needed. SInce when have pliers been a substitue for a spanner??? Darn it, I don't even like using adjustable spanners if I can avoid it. Incidentally, I find I need 3 sets of spanners to work on classic computer stuff : Inch size (to fit USA built stuff mostly). And I need odd sizes like 11/32" sometimes. Metric sizes (needed on just about anything modern-ish, and everything European). BA sizes. BA is a strange thread used mostly on older British stuff. You need BA spanners to work on Creed teleprinters, for example. AAnd yes, open-end, ring (box end?) and nutdrivers are all useful. -tony