Einstein is worth considering. Superb dynamic, bass weight, top extension, and silky mid/top. Best part is you can put different tubes in different input to tailor the source!
ARC Ref 3 is very system dependent, bass can sound weak and cast a greyish tone on all notes.
My choice for a solid state design with the ease and flow of tubes but with bass authority and weight would be the Karan Reference MKII preamp. The UK importer apparently prefers it to his CJ ACT II series II.
Are you talking CJ ACT Series 1 or the CJ ACT Series 2. I've had both. Currently using a CJ Premier 350 with the Series 2 pre. Amazing. The Act 2 Series 1 is not even close to the Series 2 -- a complete different animal even Conrad Johnson will admit the Series 1 was not their best effort.
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