Moving the Soundstage; Help.


Looking for advise... I installed new Tung Sol EL34B's in my amp, burned them in, and they sound wonderful. The problem is the soundstage is now forward of the speakers. This has never happened with my system before, even with changes between SS amps, tube and SS preamps, cables. My system has always been laid-back with mid-concert hall seating; now I'm in the first row. Do to room size, I listen from 8 feet away in the near-field.
I'm using triode mode (30W push-pull) with all Mullard NOS small signal tubes. Sonics are textured, realistic, and dynamic with tight bass. Prior to this, I was using new production Mullard EL34's with Brimar input tubes. Sonics were textured, holographic, with a nice top-end, but bass was too light and soft.
 
It's an all single-ended setup with an Atma-Sphere UV-1 preamp using 1950's RCA Blackplates, short bottle. I'm using Gallo floorstanders with Purist Aqueous Luminist cables, all of which produce wide and deep imaging.
 So, my first thought is to try different 6SN7 preamp tubes to move the soundstage. But here's the rub, I don't want to make a change that will increase high-end extension.
Perhaps, changing room treatments? Any help is appreciated.


128x128lowrider57
Gosh, I would be thrilled with those results if I were you.  Have you checked your SPL at your typical volume settings? Maybe now you can turn it down a smidge and now adjust volume to bring the forward/back depth to where it used to be because now you have more microdynamics that you are concluding as "more forward." I've notice this too on my EL34 monblocks (also running Tung Sols) whenever I retube.  Try turning up from silence while using only your ears and pay no attention to the actual volume setting. I'll bet you can achieve the same depth and you'll find it's at a lower setting.  Let us know...
Thanks, great idea. Yes, microdynamics are terrific and I'm hearing everything.

But still wondering if more/less absorbtion will make a difference.
I remember this English trick that placed the vocals behind the speakers. Back in the 70's some purposely recessed their mids in speakers a couple of dB to give the illusion of depth over their US competitors, even some Australian manufacturers used this trick. Trouble was it also sound dull and unexciting.

Cheers George  
lowrider,

You might experiment with absorption but recall that diffusion can be just as important to tune the room properly. I am a big fan of Auralex' products, both for diffusion and absorption