Early 1970's RCA portable.

[zeno]

Mystery solved.
This chassis is very different than the other CTC53.
All the Sams I have #s' 1201, 1271 & 1452 are nearly
the same. This one is different in the tube compliment,
filament circuit & it has a HV reg tube for starters.
Enuf IMHO to give it its own CTC series. I would guess
its an export only rig so they just put it in the CTC53
family since its "close". Shows why beyond general discussions
you need very complete info on chassis & model.

73 Zeno