I will let you decide that for yourself after reviewing some experiences of others: http://audiokarma.org/forums/index....owing-fuses-after-triac.834626/#post-11893645 "I put one in a KA-7100 a while ago and it made the transformer hum. Not related but seems they are not 100% all the time. No idea what my problem was, hope you find the solution to your problem." http://audiokarma.org/forums/index.php?threads/kr-4070-switch-fix-with-triac.794467/#post-11005282 "Did you experience an increased hum of the power transformer after installing the Triac switch? I've done this mod to several of my units, but the last one I did (Yamaha CA-810) suffers a hum of the power transformer. Very odd." http://audiokarma.org/forums/index.php?threads/nad-3020-buzzing-noise.645230/#post-8579268 "Do you hear it through headphones? If not, your speaker wires could be acting as antennae and picking up some radiation from somewhere. Is the unit closed up, or are the top and/or bottom covers off? I had this problem with a triac power switch mod. Closing the unit up eliminated it." http://audiokarma.org/forums/index....d-update-a-ka-7100.713661/page-6#post-9727960 "Turns out my transformer hum was coming from the inclusion of the triac. Its been removed for the moment until I can work out whats going on with it, zero hum again." http://audiokarma.org/forums/index.php?threads/au-777a-fix-up.628727/page-2#post-8382410 "EDIT: I'm getting some non-volume-dependent hash through the speakers with the triac installed. Moving it 18 inches away from the unit with some jumpers makes no difference. Taking the triac out of the circuit eliminates the hash. I haven't noticed any hash on the two amps and the receiver I've installed triacs on. Gotta give this some thought." .