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
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
@stevecham ,
yes, diffusion might be more effective. Don't know since I've never used any.
 I'm in a living room, very well treated, and I have 2 DIY absorbion panels on the wall between the speakers. They've been very effective for focusing the image.
@lowrider5710
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 would have offered burning in the new tubes was in order, but you say you did that already.

No other chages at all? Now its front row from mid hall.

Initially the thought was most tubes were old or well wron and new fresh ones provided what should have been all along except you said the situation continued even interjecting an SS amp, if I read it correctly. Though, SS amps have quite different dispositions with respect to listening perspectives.

It seems a pretty sure bet the new 34 tubes have rearranged your seating perspective. Or, something else was changed you’ve overlooked or forgotten. Isolation footers for ex.

I had one instance completely opposite of yours wherein I had a front third of hall to mid hall LP and a pair of 4-5 db more eff speakers rearranged it forward to a front row LP.

I changed EL34s to CED ‘winged C’ from JJs. No diff.

Then I changed some 12AT & 12AX to NOS RCAs. No diffs. Later another swap from those same NOS RCA 12AT7s & 12AX7s to Amperex bugle boys in my line stage next, LP remained the samebadnwidth was vastly improved dynamically with great bass improvement. Still a very close perspective of the performance and performers.

In a BAT VK5 line stage I saw Phillips, Telefunkens, and some but not all Amperex’s lay the SS further away from the LP. Installing Amperex PQ US 7308 white lables did edge it closer to the LP.

As I began to enjoy that wrap about the head at times presentation I became very OK with it.

Some pcs later on did migrate it away from my LP but I had been tainted and passed on those more ‘laid back’ sounding power cords as they came and went.

I would tend to agree some things could fix it… maybe. Different EL34s as everything migrated after they were inserted might revert it.

Perhaps too if something akin to Amperex 7308 Orange color only, not white or green, can be had somewhere in the preamp, then maybe that’s a fix. Although a 6DJ8 – 6922 replacement, maybe Amperex made 6SN7s. dunno. Their orange lables had a decidedly laid back presentation. No sonic issues though but subjectively a bit more polite akin to Levinson amps voicing.

70s models NOS Phillips came closest to the Amperex Oranges.

Never cared much for Tunsol input tubes, only 5881s.

Room treatments using absorption about the LP might reduce the ambient cues you are now more aware of since the new ELs arrived. Don’t think diffusion would do the same thing there. But then, maybe. Shouldn’t be too hard to lay up some soft squishy items beside and behind your LP. And or, some at reflection points, even above the speakers or just above and forward of them.

Diff EL 34s, diff Power cord, or room treatment rearranging.   Perhaps all of it.
Very good luck. Hope it works out and you come back and state what it took to regain your listening preffs.