I've been intrigued by these cheap power amp modules all over the internets like these: http://www.ebay.com/itm/New-TDA7293...453807?hash=item212065a7ef:g:6SkAAOSw-itXqBqT http://www.ebay.com/itm/YJ-IRS2092-...610289?hash=item41a74b64b1:g:Z44AAOSw7ThUmTXS I'd love to pair them with one of Runoffgrooves preamps and test the waters in solid state amp building. I see one of these would take AC direct to the board, and the other would take true DC + and - with a separate ground directly to the board. I happen to have a 250VA non-center tapped 50V transformer kicking around, and also a 100VA 24V non center tapped transformer. I've tried wrapping my head around the power supply, I can easily rectify, filter, voltage divide, and put a regulator in for the preamp, but what do I need to know about using either of these power amps with the transformers I have on hand? The lack of the center tap has me nervous about attempting to rectify for the larger module. And sending the 24VAC directly to the smaller board seems to good to be true. Any suggestions?