I would expect the Thors to have no trouble driving the Sound Labs, though you might want to check with Paul Marks for his thoughts. I can describe the impedance curve to you if you'd like. The Thors use the same output tube complement as the SoundLab-friendly Wolcott amplifiers, and have a beefier power supply and probably even better output transformers (of course they also retail for 2.5 times the price of the Wolcotts). The Thors are rated very conseratively, so don't be put off by the "only 150 watts" rating.
Sound Lab has been shipping the higher efficiency panels since the early part of this year, and the feedback I've been hearing is consistent with Albert's estimated 6 dB efficiency increase. In addition, dynamic contrast and liveliness are improved, though this may be a side-effect of the amplifier not having to work so hard.
Sound Labs are still a difficult load, and at best of only moderate efficiency, but at what they do well their performance really is "in another world", as Albert said. Disclaimer - in case anyone doesn't know, I'm a Sound Lab dealer.
Sound Lab has been shipping the higher efficiency panels since the early part of this year, and the feedback I've been hearing is consistent with Albert's estimated 6 dB efficiency increase. In addition, dynamic contrast and liveliness are improved, though this may be a side-effect of the amplifier not having to work so hard.
Sound Labs are still a difficult load, and at best of only moderate efficiency, but at what they do well their performance really is "in another world", as Albert said. Disclaimer - in case anyone doesn't know, I'm a Sound Lab dealer.