What SET amp can drive the Von Schweikert VR1-89dB

Look at a low-powered,Class A SS amp. Tubed power amps are nice, but can be maintenance nightmare.

Depending upon your SPL needs, you could possibly get by with a 300B SET with about 8 watts. This would be marginal in my opinion. Probably most people would be happier with a little more power, like an 845 SET with about 20 watts. If you like the parallel feed SET amps, you could have a little wider selection.

The Vivas should work fine or possibly the Sophia Electric 845s/Princess rectifier.Happy hunting.