I just purchased the lawson L251 tube mic to replace my Neumann TL103. I have a ten day trial on this mic. Out of the box, i have to say that i am not reallying hearing a huge difference between the two mics. and i might even say that i am really disappointed. My signal path is the mic directly into an avalon M5 then into my motu 2408. In my side by side comparison of the two, the L251 has slightly more clarity over all, but seems to have less output. I really have to crank my avalon to get a decent signal. (I have checked that i have the pad switch off). To me, the L251 and the TL103 are sounding very much alike. I am going to call support on Monday, but meanwhile, i was wondering if anyone has worked with lawson L251 and could give me any tips, feedback, etc... For $2500 i really was expecting to hear a bigger difference between the two mics. I wonder if i should have went with the Soundelux E250.