The Best Guy (so far) on YouTube for best presented, well explained, interesting and varied electronics projects – absolutely excellent info – Great Scott!
Before you watch anything else on this site – watch this video on electrical safety, death and pain thresholds!!!
w2aew – Alan’s Basics Series is very good for beginner/intermediates
For vintage analogue amps and receivers – XrayTonyB:
For very detailed more complex projects, Scullycom: