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If it is a color set odds are the boost rect that suppose the G2 pots is bad or the circuits biasing the gun need work. The dot on screen indicates you have some HV and some CRT electron gun emission....If it is a rectangular CRT color set any other deltagun CRT the same size should be swappable...you could rob one from a common Zenith CCII or RCA XL-100 from the mid 70s (those sets can often be had nearly free). Note in 1968 the government passed law requiring tubes screen area be changed from bulb diagonal to viewable area diagonal. The numbers at the beginning of an alpha numerical CRT type ID number indicate screen size (typically in inches). So a 25AP22 from 1966 would become designated something like a 23VAP22....the first letter of 1968 and newer parts typically had a V to indicate viewable area measurement standard.
If rectangular color and you like the cabinet I'd go for it and keep an eye out for a spare CRT just in case.
You really need a CRT tester or a friend with one when evaluating a set for purchase...There is a thread on ARFs TV section on how to do a crude test with a battery, DMM and a resistor. No matter what you test with knowing your tester is important....my B&K will show monochrome tubes that can produce a decent watchable picture at the top of bad and color tubes that are barely usable at the bottom of good.
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