EL 34 tubes

KT77 will give you a uniform top to bottom sonic presentation. They are very transparent. I found to be to be light in the mid and upper bass. 7581A is in the 6L6 family and has a beefier bass sound and is tonally more dense. Have fun!

Has anyone tried the Sophia Electric EL 34?

I used Sophia EL34's in an AVA "Ultravalve" and thought they sounded great, at least compared to the stock 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.