Tvad, this moving of the image to in front of the speakers and way outside the speakers it typcially achieved with out of phase signals or room interactions. "I Robot", DSOTM and "In Rainbows" are recording examples that should fill a 180-degree image from the listening position in two-channel stereo, because the engineers added lots of phase anomalies in mixing.
To the outer edge of the speakers and with lots of depth from the front plane to beyond the rear wall is more typcial. It's unrelated to tubes vs. SS, IME.
When you start hearing an unusually large image (well beyond the speakers and/or with unusual height) that'll be due to some phase anomaly and it's usually not "accurate." A high ceiling (particularly with a dome), oddly shaped sidewalls and other room irregularities can contribute hugely to this. If you hear it due entirely because of electronics, then there may be some designed in phase shifting to create more than is really there on the recording. Carver actually made a living for a good while doing this.
It's not a tube vs. SS thing. Put ARC and Rowland side by side and you may notice some very small imaging differences, but one won't be "holographic" and the other not.
Dave