Tubes work by controlling the flow of electrons between two plates. As long as the plates are aligned properly relative to each other it really doesn’t matter how they are positioned relative to the glass. The glass is there only to enable the vacuum that allows the whole thing to work. It can be any shape, angle, what have you.
That said, if it bugs you it bugs you. Since they are willing to exchange then you simply have to decide if it bugs you enough to be worth shipping it back for another one.
Tube rolling in my book is pretty small beans. But there’s guys for whom finding the great white whale is what makes life worth living. Which one you are you will probably only learn after wasting, er I mean spending enough time and money on it to find out for yourself.
That said, if it bugs you it bugs you. Since they are willing to exchange then you simply have to decide if it bugs you enough to be worth shipping it back for another one.
Tube rolling in my book is pretty small beans. But there’s guys for whom finding the great white whale is what makes life worth living. Which one you are you will probably only learn after wasting, er I mean spending enough time and money on it to find out for yourself.