I have 4 NOS Tungsram 12ax7's as well and for me, they sounded too vintage in my system. They were very "tubey." It's definitely nice if that's what works in your system, but they sounded congested and nasal sounding in mine.
They seem unique compared to new production tubes although I thought they most resembled the JJ 12ax7 sound, with additional density to the sound.
Nonetheless, the purchase kind of prompted me to get away from tubes, altogether.
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Christian
south: Mark Levinson No. 52 pre, Bricasti M28 amps, Lumin A1, Oppo BDP-205, Pioneer CT-43, Sony SS-AR1 Speakers, Audioquest Dragon PCs, Audioquest speaker cables, Audioquest interconnects, HB Power Design Powerslave Star Galaxy power distributor
north: Vitus SIA-030, Luxman D10X, Sony TC-KA3ES, Harbeth 40.2, Siltech cables
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