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I've tried them. It's got to be the 6GH8's.
DONT use the International/Lindal brand. Some runs of the RCA 6GH8's were better than others. I've had issues with GE 6GH8's in the past.
Side note: I replaced the 6EA8 in my CTC-10 tuner with a 6GH8. It worked good enough to leave it in. That was years ago.
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