80's Rauna Ymer Tower Speakers Advise on Swapping Low Wattage Speakers with Some Kicks!

I picked up 2 of these speakers 2 years ago and they are in pretty good shape. The original Rauna are setup for a hi wattage amp. It actually sounds good on my 70's Sony 150 watt per channel amp. But I been wanting to set it up to match my low power tube amp 65 watts per channel Yaqin MC-100B. Total is 4-KT-88 on both channel. I prefer the linear mode. But occasionally I switch to the soft mode. I listen to a lot of old pops. Well just call it like this Phil Collins Seriously Live in Berlin.
. Any speaker recommendation is great. Thanks... Joe