If you are looking at this item then I am confident you know quite a bit about this unit.  I acquired from an estate sale close to home.  Seller at the estate could not tell me anything about it.  What I do know is that this unit  powers up as you can see from one of the photos.  Condition is used therefore signs of wear are visible such as light surface scratches and dings.   The output knob is nowhere to be found but I am confident someone out there can get creative.   The photos shown are pics of this unit in as found condition.  I have not in away way cleaned or wiped this unit down.  If you have questions, please email me right away and I will try my best to reply.   Note that like my other auctions, this/these item(s) is/are also being sold as is as found.  Shipping is via Fed Ex only (Yes, Fed Ex).  Sorry but no international shipping here. Thanks for viewing my auction!