Bought (auction high last bid) a Sansui 9090DB this week ($612, I think). Came fast from Indiana via Fedex, shipping alone cost $60+. Saw a few 9090DB's in past few weeks on GW auction site, fell asleep, got otherwise occupied, didn't bid, or got outbid. Wasn't gonna let this one go by(e). Well, maybe I should have let this one get away. Yup, red 'prot' lite blinking. Don't know how they photo'ed it, two of the bottom round black foot things missing, screen that should cover big heatsink in back missing. Leastwise and TG, all front levers, knobs, etc. are present. Wood case a bit beat up, but that's what I do ! May not work a lick, but that case is gonna look mighty purty!
Already found several bad diodes on the driver board F-2426, but all caps tested so far are OK. All 8 power trannies in back look like someone scraped all of them across a concrete driveway. The 4 NPN's (2SD424) test well w/ Hfe 41-45. The PNP's (2SB554) are wacky, test good(?) but w/ Hfe's ranging 13 28 68 and 74.
I wanted one of these beasts, I bought it, I'm gonna fix it. If it was easy, I guess I would not appreciate it as much as I will when done. In the meantime I will listen to my sweet 9090 bought in mid 1970's at a Sam Goody just north of Radio City Music Hall on same side of 6th and a block or so south of 'Blackrock' where I worked at CBS. Red light on that one was blinking away, too, until my good high school buddy, George Altemose, electronics engineer, 'par excellence', and his co-worker, Ed Palmese, helped me restore it this past Fall.
Moral of this ? Know what you're doing, or know people who do (and who are willing to assist), have a lot of time on your hands, and ALWAYS be wary of long distance buys from outfits like Goodwill. Buy local if at all possible where you can see before you buy.