Glad to see this post. I've been running Ruby EL34 BSTR's and find them to be the best of the four, in fact I just bought an extra set. KT 77, missing something in the mids; EL34 Svetlana's, nice but not as full; original Cayin EL34. Running a Cayin TA 30, jdsl isn't this is a great integrated for the $. Always looking of something new to try. Bob where and what did you spend on your siemans german Black plate single halo matched quads?
Tom