I have the LL1 Sig Ref 4 piece pre combo en route to replace my LL2.1 which exists alongside an LP2 and feeds M1.2's which in turn feed Marten Birds. Had a little fun changing out stock tubes for Telefunkens, WE 417a, RCA's, and all. Though I really haven't heard too many other systems due to being in a small market and not attending any shows I just read and buy and cross fingers. In the end I really like the sound I'm getting from the Lamm's as it seems so real and natural and lively whether rock, jazz, vocals, acoustics, horns, or orchestral. So I 'm doubling down in an effort to move up the chain and picked up an LL1 Sig Ref. Any advice re: retubing, cabling, powering, etc? Anyone drive 4 monos with this pre as I was considering picking up another pair of M1.2's to drive another pair of Marten Birds I have sitting idle at the moment.