iirc Nacho said the transistor has a habit of going out (the big one on top I was assuming). He posted a brand/part # of a better one. I have it wrote down somewhere. might be worth a shot.
If you have that part number/mfg, send me a PM.. I'm a Product Manager for a semiconductor manufacturer. The transistor you're referring to in the front of the orange box (silver, somewhat football shaped base with a round cap.. This is a TO-3 package which we make many parts in this package. I don't know what the actual device number is or if we definitely make, but if we do have an equivalent, I can get a couple and send to the OP to try out.
Bob
