@jond
@zadfrak
Thanks zadfrak for your contributions.
Although it doesn't really address the SophiaEL34, I included a link (listed below) that provided you have not previously seen it; you may find interesting/helpful
http://wallofsound.ca/audioreviews/tubes/el34-tube-comparison-with-tubes-supplied-by-www-thetubestor...
@zadfrak
Thanks zadfrak for your contributions.
Although it doesn't really address the SophiaEL34, I included a link (listed below) that provided you have not previously seen it; you may find interesting/helpful
http://wallofsound.ca/audioreviews/tubes/el34-tube-comparison-with-tubes-supplied-by-www-thetubestor...