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@nd4speed thanks for the info.
are there any difference between the Takatsuki 300B old and new , except for the price difference?
I don't believe so. I asked Keiko from Amtrans if there were any internal design changes to this new batch of tubes and I was told "The renewed TA-300B will be the same internal design". However, the press release on the renewed tube mentions numerous "improvements", but relative to what? The original WE? Google translate didn't provide a very articulate translation. Perhaps if someone here reads Japanese they can offer some help:
http://www.takatsuki-denki.co.jp/pdf/TA-300B_TA-274B_pressrelease120308.pdf