At a gig when my tube guitar amp was humming, probably because of interference from lights or wiring at the venue, the soundman plugged one of these in between my pedalboard and amp and the hum disappeared. I made a note of what the hum cancelling device was called and bought one myself. This is very handy - especially when playing solo gigs with clean sounds through a tube amp, where humming and buzzing from the amp can be very annoying. This little box has made hum a non-issue on many occasions now. A great tool.
Really useful for when you can't find the hum in a hurry! Used at festival changeovers in a rush before and really saved the day when it wasn't obvious where the noise was coming from. The box is build really solid overall quality feels really good, I wouldn't worry about carrying a spare item with this, I feel it is very reliable and it has certainly never let me down. Maybe write your name on it or something though as it could easily go walk abouts in a festival situation! Anything that can identify it to you would be sensible. Highly recommended and it's always in my tool box!
* Ceny zawierają podatek VAT. Do ceny artykułu(ów) należy doliczyć koszty wysyłki. Oferty ważne do wyczerpania zapasów. Za błędy w opisie i innego rodzaju pomyłki nie ponosimy odpowiedzialności. CK=Cena katalogowa produktu