Back in the 50's I began a fascination with radio. In 1962 I began studying for my first FCC amateur radio license and took some basic electronics classes at a local radio club. I studied radio electronics manuals and handbooks and sat for and passed two FCC license exams. I was already playing guitar a bit and began working on guitar amps for friends and friends of friends. In the 1964 I got a job working after school working in a TV repair shop. The old TV bench jockeys didn't like working on stereo, hi fi or guitar amps, so I got to work on those...plus I got to sweep the place out too. I continued learning about vacuum tube theory and associated circuits and got some more training while in the USAF as well as taking college courses in both electronics and solid state physics. I kept studying through the years (passed another FCC ham exam) keeping up with the "state of the art" and finally ended up owning a music store and service center after I retired from the USAF. I continued with that formally until 2013 when I decided that I'd had enough of the "state of the art" and shut down my business. That's the short story of it all... I still do limited amp work for a local store on vintage fender, marshall and ampeg amps....and some solid state stuff when they talk me into it.