Need a 10BP4 Pic Tube

I picked up an Admiral dual chassis (1948) and have it all ready to go... except I just found that the filament is open on the picture tube. I hope someone knows where I might find one, as I have put a lot of time into this chassis (full recap). Yes, I shoulda checked the pic tube first, but the last user reported that it worked when they put it into storage. Could shipping have opened the filament?

Dan