Power conditioner/strip

Clarus makes excellent power conditioners.  The have have only offered 15amp devices but they have a brand new 20amp conditioner coming out soon.  Might be worth a look to get something from a reputable company that's a fresh build.

I have a Puritan Audio PSM156 (6 outlets) and a PSM1512 (same thing, but with 12 outlets). They're not cheap but can handle a 20A input. Great impact on dark background, elimination of hum, etc.. AND... I also have 3x units of the VINSHINE x KINKI "TAIHANG" these units have 4 outlets and are "only" USD $1,425 (SGD $1,794). These Tai Hangs have a lot of power capacitance and can drive all of my amplifiers, while providing great filtration. Underappreciated, I think, especially for the price. Vinshine Audio is an awesome outfit in Singapore, with beyond excellent customer service and they ship worldwide. Check them out: https://www.vinshine.audio/product-page/kinki-studio-x-vinshine-audio-tai-hang

All instances I have experienced the amp was restricted by a power conditioner, even in instances when the power conditioner was made only for the amp and advertised no restriction of the current. They always sound better plugged directly into the wall, Tube or solid state. 

you might want to try a PS Audio Power Regenerator. They see to get good reviews.