I agree with Grannyring, that the VA speakers need a good high current SS amp for best performance. I have read that the impedance and phase angle of the load with some VA speakers are just not suited for tube amps. You mention higher volume and dynamic range, so you definitely need more power than the Linn. Since the 75w@4ohms is not enough, I would be looking for a 4 ohm rating of at least 150w, but recommend higher than that. Since this works on a logarithmic scale, double power is only a 3db increase, which is not that much.
Again, IMHO, I recommend avoiding tube power, unless it was a beast, which would exceed your budget.