check out the new Jeff Rowland Capri pre-amp. It has 99 db steps in .5 increments.
Preamp for Mccormack .5 monos
I have been reading alot of good reviews about the TAD 150,(which I know that it is not being produced anymore)Audio Mirror T61 or the Eastern electric minimax.Which one of these would best fit my amps?They have got a 10k input impedance.I am also running Vandersteen 3a sigs.