I have contemporary Takatsuki TA-300b, and they are superb. Expensive, but superb.
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I've had 12AU7 tubes made in Japan by Toshiba for Hewlett Packard. They were awesome sounding and very close in performance (at least in my gear/system) to more expensive NOS Raytheon Black Plate 12AU7 tubes.
If you really want to see interest for your Japanese made tubes list what you have and see if anyone makes you offers or buys from you.