If the cover sez "RCA Receiving Tubes"
it's a reasonably available book,
and even reprinted. There's a number att he bottom, RC-18 or something
like that, there's versions up to RC-39 (or whatever the prefix is). If
it's some obscure industrial types the data could be hard-to-find.
Dowd archive. RCAs (almost) complete tube engineering library from the
beginning of time. If you have a question, you can post a query to the
TCA (Tube Collectors Association) list.
William Donzelli
aw288(a)osfn.org