Hello, Everybody. And thanks for the welcome doughboy. my radio blows fuse when plugging power wire up. replaced following with known good parts. voltage regulator , audio amp, reverse protection diode and in correct orientation. zener diode (d22). final, and driver. not very good at looking at schematic to follow power. would I need a component tester to test transisters, capacitors etc. any help would be appreciated. thanks. hope I can be of some help to someone later on.