I just purchased a new 112 TA-30 today, and have been playing it for the past several hours. I haven't noticed any significant hum from either channel in any mode with or without the FX/Reverb switch engaged. There is some slight noise when I push the gain/volume, but really nothing that bothers me. It sounds like others have experienced way more noise than I have, but it is impossible to know without hearing what others are hearing.
I do wish the reverb was footswitchable with the included footswitch, but that is not a big deal for me because I usually set my reverb very low anyway. I also realize there is a reverb specific jack in the back where one could include a separate reverb on/off footswitch that would allow for toggling the reverb on/off. I will not opt for that for now.
Other than that I am completely BLOWN away with the fantastic sounds that are easily achievable through this amp!!
In my few hours with it so far.....I am particularly impressed with the awesome "rock tones" that I can achieve out of the top boost mode while following the settings from the manual on the first example setting on the second page. I opted to pull the cut knob (which is indicated as optional in this example setting) to act as a master volume to tame the beast! All that I can say about this sound is WOW!!
I have spent a fair amount of time in all modes using all of the power selection options....and I am very pleased so far!!
This is an excellent sounding amp that is very easy to dial in great sounds in all modes.