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Questions about tubes and gear that glows.

We still don't know what the OP really wants

If we knew what kind of sound the OP wanted by rolling his 12AX7s, we could make a reasonable recommendation. BTW, I had a Jolida CDP with a tube output stage. The stock Jolida tubes were Chinese 12AX7s very harsh shrill and empty sounding. I tried some really nice 5751s, as you know I would, and they simply didn't work in that circuit. It was the first time I found 5751s didn't function. I still haven't a clue why not . Those very tubes worked quite well elswhere. I then put in some Mullard Mil Spec, I think CV4004s and the sound was dramatically improved, better tonal balance, rich full mid bass, etc. as you might expect from a Mullard. If the OP wants a clean strong signal tube, perhaps a Raytheon or a Tele might be in order, we just don't know.

Steve


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