Audio Research Preamp Experts?

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The solid state LS-10 is a killer preamp. It is almost never for sale here on the 'Gon. The blackest background I've ever heard. So quiet it's scary.
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low/absent noise level with sp-16 is similar. I did not think tubes could be that quiet.

When there is even a minor tube issue though, you here it. My sp16 developed a very low level whine when I first hooked up the BC monoblocks. I thought it was the new amps at first. Shuffling the 6 12AX7's internally eventually eliminated the issue somehow. Back to dead silence ever since.

I don't get the fortune in maintenance for the SP-11 MkII. I recently had mine completely serviced by ARC authorized tech (High End Audio Repair in Brooklyn) and it was very reasonable even if I did supply the NOS tubes (Telefunken CCA for phono and the rest Mullards). I did not know that they had become so expensive, though. Unless you upgrade so frequently that you don't keep a piece for long, maintenance is required for any gear (except my Kenwood tuner :-).

Well my direct comparison between the REF 3, SP-11 retubed and SP 16 and other AR preamps were very revealing. I did not play with tube rolling or change cables, etc. I simply listened to music with one unit, unplugged it and connected the other and listened to the same music. The SP-11 (retubed mind you, with AR supplied tubes) was wayyyyy better than the the SP-16. It was not even close. I would even classify the Sp-16 as being a lower high-end or upper mid fi pre-amp. I'm not kidding. It wasn't close. However, the SP-11 was close to the REF 3 to the point where I seriously questioned buying the REF 3. The REF 3 was better, don't get me wrong, but the price difference, wellll, was it worth doing it. In my opinion, it was! I find myself no wanting to stop listening. However, I sold my SP-11 for around $2,300 and that was a fair price. So, whom ever is listing an SP-11 for $5,000 or even over $3,000 is asking way too much.

I have not heard a direct comparison between the SP-11 and the SP-15, but people who's opinion I respect tell me the SP-15 is on the same level as the SP-11 MK II.

enjoy

Minor, what is the rest of your system you are auditioning ARC pre-amps with?

I've heard a lot of high end systems and I am quite pleased with the sp16 in most every regard. What specifically did you hear different between it and other more expensive ARC pre-amps?