Email Charlie at Vacuum Tube Valley--he will answer you right away, even on weekends, and knows EVERYTHING. I just ordered a ($$$) quad of NOS Sylvania 6SN7's from him for my Cary SLP98.
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Obviously I'm not seeing the BAT material, but BAT has to be addressing the OUTPUT tubes, not the frontend tubes. Various versions of the 6SN7 are rated for higher Voltages than others, but I've never seen an audio-equipment manufacturer write anything like that about 'N7s.
Buy what you want to hear and don't worry about your 'N7s' Voltage ratings.
FWIW, my favorite 'N7 is the Tung-Sol RoundPlate, and 2nd is the Ken-Rad. Both are slightly warmly balanced, NOT bright but have high-quality treble, and more spacious than the average 'N7. To my ears, the TS-RP is slightly more-spacious sounding than the KR, so of course I spend $150 for them instead of $40 for the KRs. No one ever said we audiofools were logical.
Jeffreybehr Well thanks a bunch especially for the review.
the idea about the 600v was told to me over the phone by a BAT tech when I was inquiring about tubes and their cost fi retubed using all BAT tubes. $490, plus ship BTW.
I specificially made mention of the 6sn7 not the output tubes... but ya know, the tech may just have mixed up the two come to think of it.
that sure is a dramatic price diff from $150 to $40. Per pair? ...or each?