I’m confused. You say you have a Herron tube linestage, but then say you’re looking for a tubed preamp - which you already have. Am I reading something wrong?
In any case, any good tube linestage/preamp should do a more-than-decent job of providing a 3D image (especially compared to solid state) through your speakers. I’ve had tubed preamps since on and off since 1985, and they all create a more holographic image - but only if that is on the recording. They don’t - and shouldn’t - produce a 3D image if it’s not on the recording.
Solid state can give more focus and specificity to images, but doesn't deliver the true 3D effect the way tubed components do.