See answer below ? Van: P Gebhardt via cctalk<mailto:cctalk at classiccmp.org> Verzonden: maandag 17 september 2018 19:54 Aan: General Discussion: On-Topic and Off-Topic Posts<mailto:cctalk at classiccmp.org> Onderwerp: Looking for two DEC H445 power bricks for PDP 11/40 project Hello list, last year, I was able to obtain a BA11-F chassis for my PDP 11/40 build-up project. The power supply to run a system in basic configuration is complete except for two H745 bricks (delivering -15V) which are still missing. I'd be very happy, if anybody could consider parting with one or two. Location is in Germany. Please contact me off-list. Thanks a lot in advance for anybody of you helping me to work towards a running my first very classic PDP-11! Best regards,Pierre ------------------------------------------------------------------------------- Pierre's collection of classic computers moved to: http://www.digitalheritage.de Hi Pierre, As far as I know, the 11/40 uses only one H745. And vague memory seems te recall that the -15V brick is an ?odd one?, because, unlike all other bricks, it needs the +15V from the regulator that is inside the H742 block. But I could be wrong ... If you have a faulty H745, you can probably repair it. It is not too complicated, and when you have a +24 .. 30V DC power supply on the bench (and possiby that +15V DC) you can check the H745 out. It?s a secundary switcher, so safe to work on. If you don?t have any H745, let me know. No promises, but I can check what I have on a shelf (probably defective, but as said, they can be repaired). Greetz, Henk, PA8PDP