6503 question

geppy1
geppy1 Posts: 3,075
edited February 2010 in Vintage Speakers
Would there be any good reason for switching out 6600Xs or 6501s in RTA12s and putting in 6503s?? I like the 6600s better then the 6501s but have some 6503s and wondering if it is worth **** around with.
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