hello i just recentley purchased a technics-sa300 from a thift store.A steal at 9.99! but anyway it needs some help.it constantly crackles outta the right channel.the speakers are known good.Ive had a sa-200 and a sa-600 and sold them both,and this time im putting my foot down and learning how to fix this stuff,i have closets full of old stuff.i work at an auto parts store so i could use tools and follow direction.please tell me where i can start? i hit all the switches with contact cleaner so far.And i also need some bulbs,but where do start? can some one lead me to a beginners check list? ive read the manual on this site but im unclear on component fuctions,like for example where and what is a leaky capacitor and what are the symptoms? or how do i change a brake solenoid on a pioneer-ct9191? please some help or tell me where to start reading..thank you so much in advance!