GETTING MY TRANSFORMER 277V TO 240 V TO WORK

will they be as trustworthy and as pure as feeding basically 220v for the amps? thanks and sorry if I seem like trolling with these 'my dad's shopping for me a chinese amp!' threads but This is actually the only day he can do this cuz of his routine as well as window of your time is closing...Regardless if you are inside of a rural area or not, vol