RCA was a beast. Big heavy tilt down chassis, weighed
more than a Zenith ! Lots of cold PC & they loved to blow
a special fuse in the HV. If thats blown there is a
Goldenrod on it. IIRC it was $6 or $8 back then.
It was an "interesting" set....
Zenith is probably an E4025W first yr CC2 upright. Has
either a 4 lead cap or separate caps like your upright.
That gets attention first. Otherwise Zeniths easiest TV
to fix. Biggest seller that year.
73 Zeno