[NostalgiaRadioTime]

I have to say I agree with Mike. A 37-650PX is a rather advanced project. Perhaps start with a small AA5, like a post war Transitone. Something more simple to familiarize yourself with soldering, capacitor / resistor replacement. Measuring resistors, checking voltages, etc. In other words, something to practice on to gain the necessary skills and knowledge. This isn't meant as a criticism or to sound harsh. It's meant in a kind, encouraging way to be helpful so that when you do tackle the more advanced 37-650PX it won't be as overwhelming.