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Chris I found the 5ar4 to be very smooth in my preamp, I liked it so much that I ordered another one, along with the 6sn7 and 2a3 they will be installed on a 2a3 amp.
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Rein M. Hi, replaced my Linlai E series tubes wit CryoTone 300 WC and can confirm that next, relatively small, but clearly audible pleasant step up was achieved.
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Rein M. Hi, tube well received and my previous reference tube Psvane Acme was replaced by CryoTone. Immediate audible effect was achieved, specially in low end - tighter and faster bass. Plus a bit better general definition in all frequency areas.
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Loh Shipping was fast. Plugged in the pair into my Supratek 6SN7 Cabernet, first thing I noticed, the highs brighten up, in a good way. Female vocals gained more life, Definitely keeping them in.