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The 5AXP4 can sub for just about any common round B&W tube used from 46 -51, possible exceptions might be larger tubes that use more high voltage than it can handle, the 30BP4 comes to mind but I'm not sure what the HV limit is.
I even used one on an RCA Projection set that used a 5TP4 by disabling the high voltage tripler so it only had about 9000 volts.
You can use it for the smaller rectangular tubes also but the geometry may be funky.
It should sub your missing 8" tube very nicely.
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