I just fired up my 330A Harmon Kardon stereo receiver. It's been sitting a while. It worked great at first but then all of the speakers on both channels starting sounding fuzzy like they were blown (it happened suddenly and I'm quite sure the speakers are fine). Is that a fuse issue? I remember changing a fuse before. Is there a reason they would blow frequently? If it's more complicated than a fuse I mean to take this opportunity to educate myself about electronics repair. I'm very mechanically handy but know nothing about circuits. What tools should I purchase? Is there a book or a site to get me going in the right direction? Thank you anyone for your time.
-David