Good Tube Selection for Atma Sphere S30?

Ralph, on your site you say that "more recently we have seen similar problems in reissue tubes marked "Tung Sol" and "Mullard". What kinds of problems? Who makes the 6sn7s you have for sale?

Jimothya,

Great link to 6SN7 information! Thank you

Clio,

I was using a Cary SLP-05 ( a left over from the 805AE monos I sold). I found a used Atmasphere MP3 here on the Gon and I am using that full time. Enhances the accuracy and realism of the S. I liken it to a fine dry wine, full of flavor but not overly sweet or lush; clean without solid state edginess

Pubul57, there are now Russian made, newly manufactured tubes marked 'Tung Sol' and 'Mullard" as the US importer has acquired the rights to those names here in the US.

What we have been finding with these tubes is very similar to what we find with the Electro Harmonix brand, as well as the generic Sovtek; if you put the tube on a tester it seems very likely that it will show leakage on the leakage test of the tube tester.

In practice, tubes with leakage can buzz if used in our amps. An additional issue has been that the life expectancy of these tubes seem to us to be really variable, some lasting only a few weeks. OTOH, we've seen US and Chinese tubes go over 50,000 hours.

I did inform the importer about these problems a good ten years ago. I was told that the 'next batch' would be different but so far that has not manifested, as far as I can tell.

Atmasphere, does this apply to the 6AS7s as well? You'd said above that power tubes from Russia were fine...