What was the last all-tube and the firsrt color hybrid made by R.C.A.
 

What was the last all-tube, the firsrt color hybrid and the last hybrid color set manufactured by "R.C.A."?

Last all tube RCA was, probably CTC-35 or so...the last version of the CTC-16 chassis.

The CTC-31 had a few transistors in the color circuits, the CTC-36 had a transistor in the vertical oscillator. CTC-38 and 39 used transistors in the IF circuit...these were the last console chassis to use tubes.

The last hybrid portable was the one that had the solid state tripler but cannot remember specific chassis #.