Groove Tubes EL34LS vs SED

to Gmuffley - are the groove tubes el-34ls teslas? how is the high end? The Siemens high end is fine, but not the "slam".Have u compared with the SED? I'm about to buy new sets and its between the groove tubes and sed. Based on this feedback, i may go for the groove tubes. BTW, i am running Brimar 13D5 and Sovtek 12AX7LPS NOS circa 2003. cables are the new Oval 9s. THX everyone!
Whodiini

It is my understanding that the JJ/Tesla El-34LS and Groove Tubes are the same. The ones that I have were made in the Czech Republic and were purchased from Penta Labs. The high end response is excellent, but perhaps not as good as the very best El-34 tubes. The SED tubes are very nice, but don't have the slam of the El-34LS.

07-08-09: Jaybo
el34's are supposed to be light in the bass...alays have been and ill be....their magic is the midrange.
Jaybo (Threads | Answers)

I would agree with you if El-34 tubes are used in ultralinear or triode mode, which is the case with the vast majority of amps. The same is not true when run in pentode mode with a regulated screen grid supply, as is the case with the Quicksilver M-135 monoblocks and the original Quicksilver MS-190 stereo amp.

Generally speaking, and relative to the other biggies, EL 34s tend to be a bit bass shy, however, with the right match of components, including cables and other smaller tubes like the 12au/ax7s, one can cull some very respectable bass reproduction. I listen mainly to large scale orchestral music and really don't feel I'm missing much in terms of heft/power. More than likely, though, the fellow who drives his car past my house now and then would disagree.

Consider Groove Tube EL34Ms made by Mullard; very dynamic and spatial in my Cary V12R. Another key with this amp is the use of BZ7 input tubes. -Lars-