That's it, a 53. I've had a bunch of them & have one good example now that I really like. They are NOT the greatest thing RCA ever sold, that's for sure. They use a low focus voltage crt that gives a somewhat softer look. They are prone to bad caps & resistors, in my experience, probably because the chassis design tends to "bake" the components. The early XL-100 was a huge upgrade. But, as I said, I do like them even with the shortcomings.
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Bryan
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