Karmicg … as far as I know, the Ref 150SE is still in the ARC lineup. See here: audioresearch.com/product/reference-150-se/
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You raise a good question about muscle power. The VT-200 is rated at 200 watts/per channel. The Ref 150SE is rated at 150/per channel. I really do not know if 50 watts is all that significant since the relationship between power and loudness is logarithmic. In other words, 25% less power may not result in a 25% decrease in loudness. Perhaps some of our techie members can offer an opinion.
Here is an interesting factoid. The VT-200 has a 674 joule energy storage power supply as compared to the Ref 150SE, which has a 1040 joule storage power supply. See the ARCDB web site here: arcdb.ws/model/VT200
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What this means is that the VT-200's power supply can muster 674 watts/per second if a music transient is sent through the amp. By comparison, the Ref 150SE's power supply can produce 1040 watts/per second in a pinch, … almost 50% more uuummpph. That's a lot of back-up reserve for an amp that is rated 50 watts lighter.
I wish I could tell you with absolute certainty that the Ref 150SE will produce all the power you need, … I can't,... because I just do not know. But I can tell you that the Ref 150SE is probably a much better sounding amp than the VT-200. And the robust power supply might be able to carry you through.
IMO, the Ref 150SE is a super sounding amp. I love it. And so far, it has not given me any headaches. I never heard the VT-200. I surmise that the Ref 150SE sounds better because it is a current generation amp and there has been a lot of water over the dam in terms of technology, design and parts since the VT-200 was first issued.
Here's another plus: the Ref 150SE uses KT-150 tubes. These tubes are really something else. IMO, much better sounding than 6550s. A word of warning though. KT-150 tubes are expensive and must be tightly matched. ARC charges $275 per tube. But here's some good news. Upscale Audio does a really good job of super matching KT-150s for ARC amps and charges $128 per tube. I just bought 2 quads of KT-150s from Upscale and was pleasantly surprised. I realize that a retube could still cost some change, but the KT-150s last 3000 hours.
And here is another most important fact: you can easily change out the tubes and adjust bias without electrocuting yourself. :) That is a big improvement over the VT-200, based on the comments above. Another word of warning. Although I have been very lucky with bias resisters, they do blow on rare occasion. Hopefully, you have a local tech who can switch out a blown resister, ... and even better in your home. The amp weighs 75+ pounds. If you go with the Ref 150SE, preorder some replacement resisters from ARC. They are cheap.
Hopefully, my comments are helpful. I am sure other members will weigh in too.
Good luck and happy shopping.