Ok. Background story. I have 6 Alesis M1 Active Mk2 monitors. The configuration of it is Bi-Amp.
Original PSU is rated
+/- 36V (2x 1A)
+/- 18V (2x 1A)
Problem with them is that PSU after few years gives up. I have two of them still working, so I want to first revive the dead ones and then
Regarding costs: Transformers will be custom made, so there is no difference in price.
Good caps 10mF rated 50-63V are about 10-12Euro (depending if single bigger or mutliple smaller ones - I prefer the second one of course). So we are talking minimum 20 Euro per +-36V filtering plus around 6-10 for +- 18V. Thats 26 Euro times 6 = 156 Euro (not much for some, but it matters to me). OTOH I have 14 2200-2700uF @50V + some @ 35V caps at my disposal at home + all LT317 and LT337 I would need. I have almost all needed to do a regulated power supplies.
@kodi seems to have fallen into the same trap as @TheAmmoniacal (who apparently gave up and never returned).
Neither of them can explain why they even THINK they need a "regulated" power supply for a power amplifier?
Until that is explained adequately, this discussion seems like a waste of time.
I am sorry I am wasting your time, I wasn't intending to.
There are no proper service manuals for those monitors and yes, I was looking over the Internet, and no - they not fit, even when the description says that they are for this particular model, all I know that on those rails voltages are pretty stable under different loads (and yes, I know how to measure peaks, yes my Brymen can do this, and yes I verified that on the scope).
Someone went a pretty long way to stabilize voltage on those rails (please see attachment how the original PSU looks like).