7BP7 CRT Question

[Rusty34]

I recently purchased a TRK-12 from another collector and he advised me the set came with two 7BP7 CRT's when he bought it at the estate auction of Dick Scovell many years ago. Mr. Scovell had been the lead camera man for CBS from 1949 - 1972 and he restored this television to working order. My question is, why would Mr. Scovell have kept a pair of 7BP7's with this television? One of them is a NOS Raytheon in the original box.