the amp produces a sound stage that is nicely defined and articulate from left to right, but not as much from front to back.I know my room is capable of that sound stage because my tube amp accomplishes it.@hilde45 Tubes have long dominated the field when it comes to presenting soundstage width and depth. I've outlined reasons why amps might be weak in this department. In a nutshell, if you want the same depth in a solid state amp, you'll have to move on from the one you have.
Its entirely fair to expect a solid state amp to be able to equal tubes in this regard. But IME you'll probably have to audition the candidates side by side with your tube amps to know you're getting what you want. IMO most solid state designs are lacking in this department and its been a problem historically since solid state became practical. But there are designs out there now that appear up to the task.