I haven't owned either component you mention, however I am quite familiar with the AR tube amps and have owned a few Meadowlarks and still do- I would imagine that would be a quite musical combination.
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I started out with AR many years ago and have kept current as to the changes they have gone through, I also have had BAT VK-150se monoblocks and a VK-51se preamp... One word
The 350-A amp has been reviewed as the finest amp made at any price by every reviewer who has had their hands on one. The 21-A preamp at $2500 is way more dynamic than the $9500 BAT.
I've had all of the Meadowlarks through Nightingales and can tell you that the Belles is as good as it gets, for a better match with Shearwaters there is a new 150-Reference amp at $2500 that is as good as the 350-A but puts out less power.
For wire you want the best in neutral transparency which is JPS or Audience