Musical Fidelity A300 or A3.5?

What are the differences between these two besides the fact that one is much newer? Is the a3.5 an improvement over the a300? or the other way around?

I would check to see if the a300 is more fully dual mono than the 3.5. MF changed what they called dual mono from one that had two transformers to one that had separate windings on the same transformer and I think it was between the 3.2 and 3.5. Look at 6moons and see if they reviewed both.