Thanks for the info on 6jb6 vs. 6JB6A. I have seen a few 6JB6 of both varieties on line, often advertised as MATCHED. I wonder how they have matched them as some have listed an emmisson only tube tester as the match unit. I am very leary of these so called matched tubes! Even the ones from the large tube sellers may be useless! I was given a T4-R4 set which I took to WB4HFN. He went over them and said that I would need a new set of finals after I had used them for awhile. I am having some trouble getting a wire up for them, but I keeping my eyes open for a nice set of 6JB6 s. Mike, KB1EZL
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