I was the one who won that auction. Since my original unit started malfunctioning I've been keeping my eyes open for another one or even a parts unit. Not wanting to pay much more than $500. I was concerned about the supposed burned out LED. LED's seldom burn out. I was worried that it might be a bad DES chip, the direction detection circuit not working but I took a chance anyway. Hell the wood case alone must be worth a couple hundred!
When I fist opened the well packed shipping box I was impressed with the look of the unit, just like it was fresh from the factory. On my original unit the lettering for the volume control is almost totally worn off from years of use, likewise the input level lettering is partially rubbed off. Unfortunately during shipping the power transformer broke lose. It was held in place with a tie-wrap that had became brittle with age. In my other unit they used two nylon bolts to secure the transformer. Luckily an exact replacement was available from Digi-key for $22, it arrived within 2 or 3 days. It turned out that the transformer rolling around cased damage to the volume control and the lf-rf balance control as well. Lucky again I had some dual 50K Alps pots that worked to replace the broken 25K ones. The only thing is now I don't have an on off switch, as that was attached to the volume control I have a pot that I could use that is 25K with a push on/off switch but I would have to drill out the hole in the front panel to make it work. Alps pots require a smaller panel mounting hole than any other brand that I know of. Being a very low serial number I suspected that it might have the National chip set (although I was hoping that they would of been upgraded to the Exars). Well it does have the National chips, but still sounds very good. I put on Areosmith "Rocks" and "Get Your Wings" direct from the vinyl and was blown away. With my moving coil cartridge and tube based preamp, I've never Areosmith sound so good and nearly discrete too!
Oh yeah the burned out LED, was actually a blown coupling capacitor. the matrix output wasn't getting to the DES chips, so the output from Rb (before repair) was due only to the DES operating on the other channels! I dropped in another electrolytic capacitor for now but will be replacing them all with film types very shortly. Anyone with a vintage S&IC should replace all the coupling capacitors if you want it to keep functioning.
One other note, I guess because the knobs are aluminum and the set screws are steel they react with each other over the years. After removing about three knobs the Allen key was too stripped to be able to remove anymore knobs or even to be usable to re-tighten the knobs. Does anyone make a quality Allen key set that won't strip, so quickly?