I forgot to comment on the reliability of the ARC preamps.
I have owned the SP9, SP9 MKII, SP14, LS2B, LS2B MKII and now the LS25 MKII and the Phono PH2. I have never had any problems with any of the preamps. NEVER!!. Currently, I leave my PH2 and LS25 on 7/24 without any service issues. The PH2 is well over 15 years in my system without any issues (albeit it is solid state).
I have owned the SP9, SP9 MKII, SP14, LS2B, LS2B MKII and now the LS25 MKII and the Phono PH2. I have never had any problems with any of the preamps. NEVER!!. Currently, I leave my PH2 and LS25 on 7/24 without any service issues. The PH2 is well over 15 years in my system without any issues (albeit it is solid state).