The clean channel on mine dirties up easier if I recall. Haven’t used it in 6months to a year. (I use my multi effect sims now)I had one for a while. From what I recall, the 15w class A switch definitely worked on both channels, although you may not hear the difference between the the modes of operation unless you're playing fairly loud.
ya 55 pounds. Does your 15 /50 watt switch work on both channels ? Is the volume level noticeably different when you hit the switch on both channels.I have one as well. Very good amp. A little bulky for a 112. A little more difficult to dial in with all the buttons but just a little. Plenty loud.