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I'm pretty sure my parents had a Lundberg (CTC-40). After it got replaced by a Zenith (a real dog with bad module connections) a few years later it ended up in the cellar playroom. It lost the picture and I found a bad diode in the Horizontal Sweep section. It promptly (in the space of a few hours) chewed up the replacement diode and being a poor college kid with no test equipment (especially to check those fancy SCRs) the set got junked. I remember a few months later reading a blurb about RCA selling the wrong replacement diodes (first time I ever heard of a "fast recovery diode"). Who knows if the proper diode would have fixed it.
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