Anyone have issues dealing with Sophia Electric ?

Interestingly enough Brownsfan, I recently purchased a used Modwright 95 with the Sophia's so I have another pair to measure and see how they fare over time. I really hope you're right about my problem not being typical because I really like the tube but at the price I expect it to last a bit longer. I may give them one more shot but plan on speaking with them first before purchasing.

"Unfortunately the sound from the Sophia tubes is unsurpassed in our experience. I wish they were as robust physically as their wonderful sound reproduction"

I have also found the sound of the A grade 6SN7 tubes unsurpassed, very linear with great extension top to bottom. Unfortunately I have less luck with their longevity. The first failure was within about 90 days of purchase. Sophia Electric replaced both tubes even though i didn't purchase the 1 year warranty, they didn't have to do that and could have said you're out of luck. Since then one of those two replacements recently failed. When testing the 2nd I noticed that it was borderline on the transconductance test, this at less than 2500 hours. So the fact that they sound great my experience to date tells me these tubes are not as robust as some of the other NOS 67N7 tubes I've used, not by a LONG shot. These are probably early results as what might be expected. The tubes in question are being used in a pre-amp output stage and the failure of both in such a short period of time indicate a QC or parts deficiency in their manufacturer relative to NOS tubes. I would be interested if others have had my experience with this tube.