posted
Way, way, way, way back when I was just a pup (1984), I had just started competing with my Regal (affectionately known as "Eruption" after a song on one of my favorite bands. At this time, I was lucky enough to get one of the first Rockford Fosgate Power 650 amps ever made. (This was the bi-polar model and only about 50 of those were ever manufactured.)
Anyway, whenever I would go to a show, we would all sit out in the parking lot and crank our systems. After a while, mine would start to sound distorted. I could then remove the amp and you could hear parts rattling around inside whenever you would shake it. After taking the unit apart, I discovered that all of the emitter resistors had gotten so hot that they had come unsoldered and vibrated out of the circuit board. At future shows, I carried a soldering iron, spare bi-polar transistors (2n6488) and extra emitter resitors. When my system would start to sound distorted, I would pop open the amp and fix it on the spot.
Finally, I used a 4-1/2 inch hole saw to drill a hole in the fan shroud and install one of those large muffin fans. That did the trick.
I don't know what made me think of this.
------------------ "Keep it Loud and Make me Proud!"
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