You need around 100 wpc to drive the SL3s well. I was using a ARC VT100 to drive mine and it was a good combination. I tried a VS60 and it would not drive them at all. I have also tried bi amping them with two VT100s and this made an improvement over the single VT100. But in the end I did not feel it was worth all the extra tubes. Currently I am using a ARC Ref 110 and I am very happy with this setup.
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