I just had a weird thing happen, I bought a Tung Sol 12AX7 for my SVT and had it shipped out here and the tube is physically larger than any one I've ever seen and won't fit in the tube shield. 
I just googled it and it seems to have been a long term problem, found a Gear Page thread from 2008 about this same thing.

I just googled it and it seems to have been a long term problem, found a Gear Page thread from 2008 about this same thing.
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Oy!