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Audio experience symphony tube rolling

Posted by msa on January 28, 2004 at 07:51:31:
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?