Depending on the vintage of the tubes, you might trouble finding data on
them.

In the '60s, TV manufacturers made a lot of extra money by changing the
tube lineup every year. This required service shops to buy several sets
of new tubes every year as replacements. Typically, the innards of the
tubes were virtually identical to older ones, but with different
pinouts, filament voltages, and combinations of tubes within the
envelopes. If your tubes are from this era, you probably won't find them
in the Handbook. You might have to get one of the later RCA tube manuals
for tube information, then compare specs with various tube types used in
Handbook projects to find projects you can build with the tubes you have.

Good luck!

Roy Lewallen, W7EL