Saw these today for the first time as as well, don't know if this is a new tube or an old discontinued one. The grant fidelity site says they are not in stock.
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I saw the PSVane KT-120s on Grant Fidelity site as well and contacted them via Audiogon to find out if and when they are going to be in stock but haven't heard back from them. I think the PSVane KT-120s are new because I think the Shuguang KT-120s were released only early last year. I hope others can confirm if the PSVane KT-120s are new and how they sound.