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If the top connector is creating a healthy arc like that then all the troubleshooting advice I gave is likely irrelevant. Try it with the old HV rect tube back in and see it it produces a raster. If not then you definitely need that tube you ordered. If it does produce a raster as bright as before with the old HV rect in it then there was some other issue that has it has temporarily recovered from.
There should not be anything in the pin of that tube socket to produce an oily substance...That oil is probably grease/dirt that found it's way into the set from outside. It is not bad (and sometimes necessary such as when dirt becomes a conductive path for arcing) to clean HV cage areas.
If you plan to fix the set your self/own it for the long haul you really should pick up a copy of the schematic/service data and keep it with the set.
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