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Well... it will be interesting to find out. As I'm sure you already know RCA had used XL for years, as far back as the CTC-16 chassis. For those of us that have RCA tube chassis' take a look and if there is an XL stamped after the number you have the top of the line set they offered. XL meant "Xtended Life" and used heavier duty components. In 71 they marketed a Solid State line with that designation. They were doing so much in marketing that I wouldn't be surprised if a tube set did have the XL tag on the front.
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