myles_rose Posted November 22, 2003 Share Posted November 22, 2003 Two "new" 12AX7 tubes I recently tested a new Sovtek 12AX7 that may be replacing the 12AX7WA. I have this data in my Tube Primer. It is a vast improvement over the WA. It may be on the market in about three months. Today (11/21) I completed testing on some new Chinese 12AX7 tubes. These look visually, like the 12AX7C9, but the must have changed the cathode coatings or something. These 12AX7C tubes, are the best 12AX7/ECC83/7025 new production tubes I have seen to date. They were very consistent. Very closely matched right out of the box. They are very quiet, at least -3dB down from the best of the other 12AX7 family tubes. These will drop the background noise in high gain amps very nicely. Current output ... amazing ... none below 1.0mA (most tubes today drop to 0.5-0.6mA) Transconductance - 1600 is spec, and all of these meet or exceed this figure. Rise time and curves are great. Very linear and smooth. GAIN - big surprise here ..... today, finding a new 12AX7 with a gain over 85 is like finding a needle in a haystack. These were all over 90, and many at 93-94+. How do they sound? Strong, big, like an great NOS find. This is just my take on things, but 8 were given to Jim Wygle who will test them with his better playing skills, in some classic amps, high gain amps, and do that shreadding thing he does. I do not know when these will hit the market, but I will post something when I know more. Myles S. Rose www.guitaramplifierblueprinting.com www.la-economy.blogspot.com www.facebook.com/mylesr www.twitter.com/myles111us Link to comment Share on other sites More sharing options...
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