Hello, I much prefer the GE 5 stars over the JAN 5814A's which came with my amp. I've tried about a dozen 12au7(5814a)tubes and my favorites are the GE 5814A USAF (United States Air Force) tubes. Not sure how hard they are to come by, and they have 2 mica vs the 3 mica that regular 5 stars have. Good luck.
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