I have an Equi-Tech Son Of Q and it did help with hum, etc in my last residence . My new place has surge protection at the panel and honestly I am not sure if it is OK to use with tube rectified gear . It runs +60 VAC on the Hot lead and -60 VAC on the Neutral lead of each AC recepticle on the rear. Never had a problem with any gear , including my SS rectified tube amps.
It definitely helped with transformer hum in the past on my mono amps . Jjst not sure if it is safe for something with tube rectification so i plug it directly into the wall and unplug if there is severe weather or loss of power