I replied once but it seems to have disappeared so I'll try again.
I did some research into the cross-overs and it seems that there is just one 100uf electrolytic cap that is typically replaced, the others are MKT caps and comments are that they don't deteriorate like electrolytics do and therefore don't need to be replaced. I don't know myself.
Looks like some options to the Mullard CV4003's. The Mullards may sound great but they definitely cost quite a bit. Looks like the 5963, 12BH7 tubes should provide some more affordable options.
Peterh, my usual configuration is turntable -> tube phono preamp -> tube preamp -> ST70, so yes, I have an all tube path with a good source.
Also, my L710's do the the supposedly "acoustically invisible" metal speaker grills. I'll remove them when I get home and see what happens.
corndog71, interesting you would mention my hearing. I have recently been experiencing a louder level of tinnitus on a continuous basis, as opposed to occasionally. I guess this could have an impact on what I'm hearing, except my system has been sounding this way for quite some time and my hearing issue is a recent development. (sucks getting older)
Thanks everyone for your input, it'll keep me busy for awhile.
I also have to say, this is a great forum!