EL 34 tubes

I'm using a pair of Sophia Electric EL34 ST tubes in my Auris Nirvana headphone tube amp with excellent results compared to the stock Electro-Harmonix tubes.  I also tried the GL KT77 tubes in the same amp but they were not nearly as good as the Sophia Electric EL34.

I had a customer just order a pair of Sophia EL34 for a Lampizator DAC and was raving about them.  Seems like they are delivering a pretty good tube.  

another vote for RAM in a RM-9

probably the highest precision match set you will find on the planet, Roger was a genius... RIP

I had forgotten about Jeff Day's review of the Sophia tubes in his Leben amp.
https://positive-feedback.com/audio-discourse/sexy-blue-tubes-the-sophia-electric-el34-st-and-aqua-2...