I am possibly looking into getting a tube amp. I don't need copious amounts of wattage as this will get most of it's playing time in my spare bedroom/office. Criteria is: 1 - It has to be a tube amp. 2 - It must be inexpensive but not a POS, used is an option. 3 -It must have 2 channels so I will be able to use the stereo jack on my guitar and split the cord into two separate channels each with it's own volume. One channel for magnetic pickups and a second channel for the piezo with the ability to blend between the two. Any suggestions?