N_Cook wrote:

From the 1970s / 1980s. I have an RCA databook with a lot of the big number
RCA transistor full data, but cannot find full data anywhere on these 1C..
ones , that is 1C ( one see) not IC ( India Charlie ).

Google, in half the hits seems, to show lesser data/ working subs I've put
on the net over the years.

Just repaired a 1986 HH which used , no problem with it, 1C03-C which is
presumably a voltage binning band, but thought I'd try locating some proper
info on this RCA range for when I need it in earnest.

What model HH and where are these 1C parts used in it ?

Graham