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generally speaking it does not really make any diff. the shunt tubes (6BK4) have more lead in the later letters to help with Xrays. Sometimes there are different internal connections on tubes but that is very rare. I would think any will be ok.
If you don't have the tubes, hold off on buying them, the horz out are very expensive, and may not be needed.
I would recommend messing with the horz hold adj a bit to see if you can clear that fold over on the left, and maybe improve the horz lineairity.
It has an external stop, see if it stays locked within the range of adj with the lock in place. If it does and you can improve it, then you may want to remove the lock and try going a bit more to see if you can further improve and still stay locked on. just flip the channel back and forth and make sure you get a good solid lock after adjusting it.
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