Parts ConneXion carries Sonic Frontiers. I'd suggest getting in touch with Chris there. He should know.
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could it be 6H23P-EB?Yes, it could. The 6H23 is an exact replacement for the 6DJ8/6922/7308 family of tubes.
You have lots of choices for replacement tubes.
Here's a good read about tubes and the SF Line 1 Preamp:
The P in the tube types referenced above is often used as an English keyboard equivalent for the 17th letter of the Cyrillic alphabet which looks a lot like the "pi" symbol. or like an inverted letter U. If it was a bit smudged, it could easily look like 6H2311. I'm quite sure that's what you have, a 6dj8/6922/ECC88 equivalent.