steveeeee

OK, looks like we're both building external PSUs then. It might take me some time to get around to doing this, but I will be very interested to see your progress. Good luck!

So I've been researching transformers online, and one problem I have is with the size. The original units are about 43mm wide x 36mm deep x 33mm tall, they have 4 input pins and 3 output pins. The case lid basically rests on the top of the transformers, so there's no room for more height. The big filter cap is directly below the 909 transformer. The RAM battery is just to the right of both transformers. The regulator heatsink runs along the left side of both transformers. The possible replacements I've found so far are all bigger (eg these, which are 68x57x27.6). Some components could be moved and/or the heatsink changed, but there's really not much space in there. The other problem is that all the transformers I found have 4 output pins, so they wouldn't go straight onto the board. There would need to be some kind of spacer/adapter, which would raise the height, meaning the lid wouldn't fit. It would be quite easy to drill new holes for the lid and fit it higher but then there would be a gap and it would look bad. If exact replacements are not available, maybe it would be better to move all the power components to an external PSU and use a 5-pin DIN socket to supply AC 18,18,9,9,GND to the MS6. How are you doing, Fairlight?

I was very excited to find this thread today, as my old MS6 has been dead with the same problem for several years (someone else switched it to 115V and plugged it into 230V). After replacing the PSU filter cap, it does turn on, but the voltage to the 7812 is too low so I think the 909V transformer is damaged. Fairlight, please do post again with your results when you have time; I would love to be able to get mine working again. And thanks to phunk for the advice and the links!