I noticed a couple of oddities about that machine.
The seller claims it's a two channel recorder but the wiring from the heads looks more like a mono wiring job and the picture of the heads doesn't clearly show two distinct tracks on any of the three heads?
Is it possible that the unit just has a second channel amp unit but that the machine is in fact mono?
Other oddities;
The seller claims that one of the tubes is broken but then talks about the availability of finding spares on ebay then in his next breath states he has a full set of spares? What's the point of all that?
Personally, I think all this, "some celebrity owned this hunk of scrap" routine a bit tiring at this stage of the game especially when the seller offers no discernible proof.
Cheers!