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Sphere is clearing out most of their Tek and HP parts inventory, including all the CRTs. I didn't see the tube for a 453 available on there.
Best bet would be eBay, look for a broken scope that gets some kind of trace on the screen. Loose CRTs show up occasionally, but the 453 is a popular model, and they sell quickly.
There is a CRT for a 453A on there now, but that won't fit the 453.
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