Let us imagine a world where someone has time on his hands and wants to redesign a Silvertone 1448 amp-in-case. Originally this amp is a transformerless amp using a 12AU6, 50C5 and 35W4 half wave rectifier. If this certain individual wanted to replace these tubes with a 6AT6, 6AQ5 (similar to a 6V6) and a 6X4 full wave rectifier what is the most economical ($) way to power this amp? The original operating voltages seem to be irrelevant for our purposes because the tube lineup has been altered. I...I mean HE would be looking for a modest 250vdc on the output plates. If my math is close, that would require a 230-0-230 PT to provide the plate voltage I need. Anyways, if you have a helpful suggestion, drop a line and I will make sure this guy hears about it.