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About 15 years ago, I was at an old radio meet or a hamfest, and someone who sells tubes had loads of these tubes, Sears branded (or they may have been 6R-SP22). The dealer had no idea what they were for.
I looked at the tubes closely, noting the shapes and spacing of the grids, and told him I thought the tube might be similar to the 6CL6 (broadband power pentode), but by no means necessarily the same base as a 6CL6.
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