Genuine question here 'cos this is most definitely not my home territory. That transformer is 300VA (2x25V, each at 6A). Do you need 300VA, or are you just putting in a nice healthy margin?
I'm interested in this, having seen the telecoms PSU's on the 'bay* at 13 quid for 50V @ 9A. Was already to unlock the safe and trade in some beloved Jaffa cakes, but it's a SMPSU so after this thread I'm not so sure.

*Item number 380071301709

Cheers,

John