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In Reply to: RE: 6sn7 GTA or GTB ??? posted by em on October 22, 2009 at 17:27:11
My preference is always a pre-1955 (or so) 6SN7GT. My personal preferences are the National Union black glass (early 50's), the KenRad 1945 black glass (or same dated clear glass version which is virtually identical in sound), the RCA early to mid 40's grey glass (commonly seen labelled VT-231 for military and 6SN7GT commercially), the bad boy 1952 Sylvania 6SN7GT, and the early to mid 50's Tungsol 6SN7GT which may or may not have round side mica spacers, rectangular side mica spacers or no side spacers at all.
After those, I love the 1943 to 1946 Raytheon 6SN7GT/VT-231 variants, as well as Hytron early 50's 6SN7GT and late 50's Raytheon 6SN7WGT, among others.
I'm not too fond of British 6SN7's like the Brimar CV1988, these I find a bit too rigid sounding, and there is no good Euro 6SN7. I've been through CV181's and B65's long ago and all the above I favor heavily.
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