I just did this for the first time on a Sansui 5050. It sounds great. Here is what I learned. Watch a few videos on how to solder/desolder electronics. Watch a video on how to “tin” a soldering iron. You can get service manuals at hifiengine.com. Replacing capacitors is no big deal as long as you use the same uf rating. The voltage can be a little higher. Transistors you need to be careful. Find a direct replacement and make sure you know what prong goes where. (ECB, BCE, etc). Resistors are easy but the coloring on the outside that tells you the resistance might have faded making it hard to know the resistance. These shouldn’t go bad and I’d leave alone. (Unless the service manual identifies the resistance). After each circuit board I would test with a “dim bulb” tester. (Easy to build). This will tell you if there is a short and you will know what board it is on.
