I had sent to me a deck that was hooked up to a system that got hit by lightening. One channel was said to be low and what I found out was between cal and uncal of the output the Pot was being switched by a 2SJ40 FET P channel transistor. Well I went looking for them and they are not all that plentiful. I ordered some and they are on the way but the parts such as the pot and this FET are not very easy to get and so you should consider this in the selection of models. The BR20 is an excellent deck- like the X2000R I still do not like that head mounting type as it has very limited movement and is more difficult to work with.