205 to 210 sec volts will rectify and filter up to about 275 volts dc,
this is if you use a solid state bridge, a tube rect will chew up more B+ so you need to add some volts for that,
so get yourself a 230 volt ac (50 or 60 hz?) to 210 volt sec with a 12.6/6.3 winding.
the 12.6 will be perfect for making 15 volts dc for the opamps,
what are the opamps for? got a schematic?
if for low level audio then you need good filtering on the 15 vdc supply.
we have places to buy cheap pwr transformers over here, but the shipping would be too high,
so you will have to dig around for a european source,
no wait, you need plus/minus for the opamaps,
scrap the 12.6 idea, looks like you need an aux winding of 30 vdc/1.3 = 24 volts center tapped (rounded up to the nearest popular voltage)
so you need a 230>210/24/12.6CT