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Here's the same color bar pattern on the Sylvania 21LC28. My Vectorscope had a cold-solder joint on the trimmer for the 3.58 MHz oscillator, easy enough to fix. I'll need to find a spare 3RP1 CRT sometime soon. The tube is getting weak but adequate for now. The Vectorscope turned out to be a pretty good $20 eBay score.
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