Does converting an amp's voltage from 110 to 220 compromise its performance? I heard from one technician that it's not advisable to do so and that using a transformer instead is the way to go. I'm actually planning to buy another Quad 306 power amp that is on sale for only about £80.00(really!), but my concern is that it's 110. I actually bought one already about more than a year ago and had its power supply converted by another guy to 220, and so far I don't have any problem with it until now. I believe it performs well despite its original toroidial transformer being replaced by two pieces of small square type transformers (sorry don't know the formal description for this). What's the real deal here? Thanks for any advise. regards