Oh right, if you already have a NNC with a monitor, then you got the chassis part solved.Thanks for the detailed reply. But why can't I reuse the chassis and deflection yoke, etc. from the current tube?
My NNC cabinets already have pretty good tubes. Not pristine mint condition. But pretty good. That said I would buy brand new replacements, to keep as spares, if they were available.
The DY you could reuse, but I had had pretty bad luck getting the stock NNC DY to work with other tubes. (A68LZU185X) - I must have tried it on 3 different 29" tubes and could always get close but the purity eluded me. Using the XV5 DY with this A68QCU770 tube has given better results and good purity, so from past struggles I found matching the DY to the tube is helpful.