before spending money unnecessary, it would be best to determine whats the actual problem, whether is it hum or white noise(hissing like)
Both are different sounding and could be from different sources
hum, most of the time, can be from pickup, grounding issues(geetar, pedals, adaptor etc) or near to source of interference that resulted in hum when playing the instrument near(a possiblity, but in local context, might not be that often)
white noise/hiss can be from cascading drive pedals together when our instrument signal get push into distortion, boosting distortion, whatever inherent hiss/noise already present, will also be multiplied into audible range and at times irritating noise source.
worst come to worst, isolate each and every of your pedal, plug in geetar, try out one by one, with battery, with adaptor, slowly adding one pedal at a time, plug in instrument, turn up volume and listen which part of the chain actually result in the problem.
other than that, a balance of gain level among all the drive pedals(especially if like doing high gain thingy, cascading drive pedal thingy) should be done/readjust as well, togther with the level on the amp.
adding more gain to the sound while might be shiok, its also a way to get loud hiss/hum which might not be too audible before, into irritating level.
