Hello, I've found 1 small firm producting input amplifiers. It's some small firm but on some forums everybody liked them on another forums there were different opinions about it. The only thing i found is some samples. There is a test of 2 product marks. 6 amplifires. PERATRONIKA MAB-2013, MLB-2013, MLB-2013_opto (in amplifier mode without compression) with the following equipment Digilab MESSENGER SPM-200, Digilab GINGER SPM-102, Long QUAD DisAmp 3 voices and 3 microphones MK-101 wave http://stream.ifolder.ru/5659416 mp3 http://stream.ifolder.ru/5659415 U87 wave http://stream.ifolder.ru/5659414 mp3 http://stream.ifolder.ru/5659418 UM-57 wave http://stream.ifolder.ru/5659417 mp3 http://stream.ifolder.ru/5659413 It's on some russian filehosting but you have to put just 4 digits so it doesn't matter. What do you think of PERATRONIKA? It has a strange price less then 200 Euros.