I haven't seen this mentioned...
I expect it has been discussed but haven't seen it yet:
Is it not very important that the tube shields have a very good contact to the grounding tab that contacts them at the base? I had a funny color problem that got better when the shield made better contact. I was going to put deoxit on it but just polished the area and put a light CRC coat on it. I have seen some tube shields that had a ground wire soldered to them. I think that was mostly in Japan sets.
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