Hi. I'm working on a Model 1 speaker. The problem was that after about 5 minutes it would fade away. I figured first that caps have gone bad, but then read that they use thermal protection fuses. I've disassembled the speakers and found that caps are actually good, but the single resistor is all burned and black, but still measures 10 ohms (because of burning off I can't tell the value it should be). There are two yellow things that look like disc caps, these must be thermal protection devices. One is on tweeter line, in series, and that makes sence. The other one, on woofer line, is actually in PARALLEL with a 4.7 uf and 50 uF caos - how does that work?? Any help appreciated. Thx