Hi, I am interested in building amplifiers for myself and a friend who I play with. I do not have any interest in selling them or building them as a business. I just want to be able to have an amp that sounds exactly like I want it to and to be able to work on it as I see fit. My amp tastes run mostly to older Marshall circuits; JTM45, Superleads and Superbasses, etc. How many of you have built these types of amps? Are they relatively simple compared to more modern style amps? Are they relatively easy to tweak? How much money can be saved by building your own? I understand that there is a learning curve, as with anything, and I definitely am ready to put in the time and effort to learn as much as I can about these circuits, and not just how to put them together. Any suggestions as to where to start? Any help would be appreciated. Thanks.