We sold both of those brands (and later, Philco, and Zenith). The RCA XL-100 stood for 100% solid state. The Quasar I was solid state, the Quasar II went back to hybrid with four tubes. Had to love all the bad connections in the 'works in the drawer'. I've still got boards or modules for those; most problems came down to pin contacts, not the board itself.
Dan
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