EL34 SED, Black Sable or Genelex Gold Lion?

I think the Siemens will give you what ever 3D is in the recording, no more no less - if you are after that quality. Since you can't really control the recordings, I would focus more on your speakers and placement than relying on a tube to give you that - tube "3d" would be marginal compared with these other factors. The Siemens happens to be my favourite tube, and is very long-lasting and reliable, especially if you buy from Roger Modjeski at RAM Labs - he also has competitive pricing on that tube. But, I have no problems whatsoever, enjoying the SED EL34s I bought from Jim McShane. In other words, they are both good tubes that should work well in most amps using EL34s.

Bjesien,
I would say if you want clarity and detail go with the Siemens or the Gold Lions. I feel that the SED gives a softer overall sound than the other two. Between the other two in my system, i've found the Gold lions to have touch softer sound in the high end. But the bass seems to go a little lower, with better weight. They are both nice tubes and I could be happy with either one. For now i'm keeping the Gold Lions in my amp.

Seems like the GGL KT77 might be the tube of choice. Can the KT77 be used in an amp that runs in either ultralinear or triode, like the VAC Avatar or the Manley amps? I thought I saw somewhere that it is designed for ultralinear use. This confused me because I've also read it's a drop in replacement for the EL34.

Thanks so much for the help.

Bjesien,
My amp is a Dynaco ST-70, but it is wired in triode. The guy who built my amp(Will Vincent) sent it wih JJ KT-77's. But all three of the tubes mentioned in this tread blow the JJ's away.

the KT77 works on in my amp in either modes, not sure why a mode will make a diff, but I may be wrong.