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7JP1 acceptable? I think they were used in Sun engine analyzers and some oscilloscopes, but I don't know how common they are. At least their non-controlled heaters haven't been repeatedly flashed in a series string TV arrangement like most of their 7JP4 siblings. I think I have one as a spare, but haven't tested it in a working set.
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Goodness comes from getting the basics right, glory is to be found in tending to the details.
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