BoogieZK, I agree with expanding one's knowledge and being safely curious. You and I have the same background; you as an engineer, me as a technologist. When I was beginning my training at a young age, I envisioned a career being a TV repair man or working in a radio/electronics shop. By the time I graduated tech school I realized that there wasn't much money in those jobs and I went on to bigger and better career positions. Sadly, in North America at least, there are virtually no more 'local electronic shops' to go to. There are some places that fix computers and TVs etc but those tend to be places like the tech department/depot at Best Buy or Staples etc. Sadly, the small repair shops are almost extinct. Repair techs that know guitar amps or PAs, etc tend to work for the larger music stores and I suspect that they are few in numbers and are contract workers, not full time employees. In Canada we have a music store with facilities coast to coast. Where I live, the repair person is as old as me and moves from store to store through the week as their only amp tech. In my retirement years, I would have liked to have that job but the store only pays that one guy. I did that work 'on the side' for the enjoyment of it, making a few dollars too. Word spread by word of mouth that I was a "tube amp guy".