Three random questions on this piece of radio guts! (ID-ing parts and the mysterious wax) Answered
So i opened this old Crown Japan stereo and found somethings i've seen before, but never had the initiative to ask their raison d'être (why are they there?).
1 - What is the blocky component with a colored screwdriver notch on them?
2 - Why do they always use this specifics pots for the tuners of radios?
3 - Why do they apply wax (often in generous amounts) over some components?
(i know all 3 sound pretty noob, but i had to ask someone)