Is there a good online course for electronics or youtube?

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I need to get a bit of basic training in electronics I would like to be able to do simple repairs on amplifiers-maybe adjust the bias voltage on my electrostatic speakers safely can anyone point me to a good online course that would give me enough information I don't want to become an engineer just be able to do a few basic repairs :)
 
Ah sweet memories or reading great textbooks for training Navy techs.... that I bought after WWII. Along with a vast cornucopia of other surplus gear*.

Must be similar textbooks around today?

B.
*sold my last WWII airplane starter motor with great planetary gears just last year on eBay
 
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