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I just received a Sovtek 5Y3 destined for my Clarinet.  The whole glass and internals are tilted off to one side, like the Leaning Tower of Pizza.  I have no way of testing it, short of plugging it in, and I don't want the thing blowing up on startup or something. Is this cause to worry?  Should I send it back or give it a try? I am just starting the build, so nowhere near ready for it.

[Tone Deaf]

It's probably okay, but I'd send it back if it's not aesthetically pleasing  

Probably safe to give it a try - just stand well back when switching on.  I once had a valve i'd dropped bul looked intact, but must have had a small crack in it.  Gave a lovely purple flash when I powered it up -impressive, but scary.

Is it loose in the base? 

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The tube is solid in the base.  Strikes me as poor quality comtrol 'tho, even if it does work.