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Tom,
The 5" test CRTs (such as the 5AXP4, and later 8" versions) were specifically designed to work in almost any electromagnetically deflected TV. The 5AXP4 features a max working anode voltage of 18KV, and automatic self focusing. While the picture displayed on the screen might be overscanned in higher deflection angle TVs, the image was (is) still useable for making checks.
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John Folsom
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