Its hard to tell from the photo, but it appears this unit does not have the full vented cover, and thus not the current 6N1P tube or current to voltage amplifier upgrades (both $450 combined if done at the same time, $300 separately).
I may be wrong, but check this out before you bid. Of course it will be a darned nice unit even without the current production upgrades.
Regards,
Frank Van Alstine