Make sure to check out all my listings after you look at this one. I dont think youll find a better, broader or more balanced assortment of antique and vintage technical items anywhere. And dont forget, you can click this link to quickly add and then save me to your favorite seller list and Ebay will automatically send you updates when I put similar new auctions online. Heres a McIntosh MA-5100 stereo preamp - amplifier. Nice case, nice glass, and it works (as you can see and hear in the video Ive posted above), but I dont think its ever been serviced, so its being offered for parts or restoration. Cosmetic condition is above average, and sonically the amp checks out okay, with quiet controls that seem to be functioning properly. The amp was removed from the in-wall system of a record collector who moved into an assisted living facility a few years ago. He was the original owner, and I doubt he kept it up to date, because its sealed up tight, with the original factory tabs still in place on the metal case. The amp comes with its original owners manual and its original warranty card, which as you can see was never filled out and returned to the factory. Although the amp works, it will likely need to be updated electrically if you want to bring it back to factory spec. I dont know what -- if anything -- will be required to do that, nor do I have the instrumentation here to measure exactly how its performing right now. To my ears, it sounds fine. To your ears, it may leave something to desired. Its more than 50 years old, so its almost a certainty that some of the caps and resistors will need to be changed out for optimal performance. The right side speaker connection terminals are a bit wonky (I think a solder connection to the terminal post is weak), and you need to make sure not to torque down the screws too hard when you connect the speaker. So...nice amp overall, buts its being offered as is, likely in need of updating, and with all the caveats youd expect for an unrestored piece of electronic gear thats a half century old. If youre looking for a mint, fully-serviced 5100 that performs exactly like it did when it was new, this is not it, and you should look elsewhere. Please review all the pictures, and consider them an integral part of the description. Thats about it. I will package the amp properly so that it arrives at your doorstep safely. Ive been shipping fragile technical antiques for more than 30 years, and I know how to do it correctly. If you have any concerns about my packing protocols, please review my ebay feedback, which extends back to 1996. Thanks for looking.