I have a Torroid in a case which puts out 18v AC secondaries - I may give it a go. I've noticed a voltage drop of a couple of volts on the 30v secondaries when the platter starts so a bigger transformer even with a lower output may not even drop the voltage?
Would this be for a new regulator or the stock regulator? 18vac will work for a LM317 but may not be enough voltage for the stock regulator circuit. I don't know for sure because I haven't tried it, but it's a potential issue to consider.