How's the Synergy between Lamm1.2ref and AR REF5

Suteetat, Try Telefunken 6922/E88CC or 60's Siemen's 7308. The former offers excellent balance of extension, articulation and natural harmonics; the latter has very nice extension (hi & lo) with a hint of warmth, more neutral than cool.

Thanks, I will be looking for those. A friend has a stash of Siemen CCA that I have been begging to try!

Thanks all for the responses.

Quick question, does anyone know how long the 6922 supposed to last in Lamm monoblock?
After Mazda, I got a hold of a pair of Gold Aero (I believe they are Mullard 7308) which also have very nice midrange and open top but the bass is a touch soft. Now I have Amperex pinched waist but the US version and not Holland (from around the same period, I believe) from a friend which are fantastic. Much better bass than Mazda/Gold Aero, the mid is not quite as rich but better focus and made Gold Aero/Mazda sounds soft in comparison. So far I am very happy but now am afraid what I would do if the tubes go bad eventually :( My friend has another pair of Holland Pinched waist 6922 but am not able to talk him into parting from him yet :)
Sorry for getting off the topic regarding ARC 5 a bit. Personally I went with Lamm L2 Reference when I bought M2.2 . I used ARC Ref3 in the past and was not all that impressed. I felt Ref5 was just a slight improvement so I decided to go all Lamm electronics including phono and found that I actually did not miss the remote all that much!