I'm not good at judging magnification. Maybe 1.5x ?
I find it kinda annoying to watch. You need to be right in front of the CRT. The lens is almost a hemisphere, so from about 45 degrees, you don't see the image at all. If your lens is shallower, maybe the viewing range will be better.
Just noticed that you got your set from an audiophile. If you're lucky, maybe he installed some oxygen-infused wires to mellow out the harsh on those lows!
Phil