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Has anyone used other than 12AX7 or its equivalents, e.g. 12AU7 or others? I'm using RCA black plates that produce a wide open, transparent mid and upper, but the warmth is gone. Any suggestions for 12AX7's or others that will retrieve the warmth?
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Follow Ups:
MSA,The Mullard ECC83 is a nice, well-balance, front end tube. Kinda like Heerlen made Holland Philips ECC83.
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