This is a new thread for the 990DB I recently purchased. It would not come out of protection mode unless the F2624 board was removed. Several of the fusistors tested out of spec. So I ordered replacements and finally got around to installing metal film resistors. No more blinking protection light! Unfortunately, I only have one channel and it is very faint. Tried FM, AM, Tape, and AUX inputs--they're all the same. No Dolby test sound. I get a light pop each time I change one of the Tone Control levers. All the fuses check good, except one so it will be replaced. I also have not had the opportunity to DeOxit any of the controls. I guess the next thing to do is test the Output Transistors (two are not original)? Should I order parts for a recap and redo the Dolby Board? I've attached some pictures for your viewing pleasure. (This thing is VERY dirty!) One more thing: Should this 990DB have a serial plate for a 9090DB?