tube amp will drive von schweikert VR4-jr?

I run mine with Quicksilver M80 tube monoblocks (80 watts per) and they sound great. They don't seem to be lacking in power at all with the VR4-jr. I recommend looking into the Quicksilver V4 tube monoblocks (conservatively rated at 120 watts per). I would love to here that combination and at some point plan on it!

I'm running mine with a Premier 11A (70Wpc). I am going to try bi-amping but with just the one amp, they seem to be adequately driven at the listening level I prefer.

More power the better. Used VTL 300's with good results, Also hurricanes, cary v-12 ect. Now using rogue Zeus, they need ever bit of that power to really get going.

You bet! Albert voices and shows with VAC tube equipment and he drove a pair of 4Jr in Vegas with Kevin's PHI Beta integrated amp with 110w/side and they sounded fantastic.