Will there be a dramatic difference?

At the moment, I just can’t spend an extra two grand. I went ahead and ordered the A21+. In the future when I have some extra money, I will probably sell that one and upgrade. However, until then I’m sure the improvement from what I am currently running to the A21+ should be amazing and satisfy my listening needs for a little while anyway.

It is a decent step up but to make better there are 1 main fuse and 4 -2 per channel fuses on the power rails  that I would at least replace with Hifi tuning  fuses

Can you tell me what size fuses and where to get these?

How exactly do hi-fi tuning fuses make the sound better

I believe that is the name of the company.  The owners manual will give you the info you need.

I had a couple Carver amps back in the day.  Pretty good for 35 yrs ago and decent prices. The A 21+ is on the warm side sound wise like the Carver.