@mesch
You might want to reach out to Jonathan Halpern at Tone Audio, he is the US distributor to see if he can quickly answer your questions. He is easy to converse with - shindo.usa@mac.com.
I will tell you that my LM 518IA has the same stated sensitivity; and in it's case the preamp circuit stays in play even if I use the LM as a power amp with a separate preamp. Not sure why the circuit was designed that way but it is.
You might want to reach out to Jonathan Halpern at Tone Audio, he is the US distributor to see if he can quickly answer your questions. He is easy to converse with - shindo.usa@mac.com.
I will tell you that my LM 518IA has the same stated sensitivity; and in it's case the preamp circuit stays in play even if I use the LM as a power amp with a separate preamp. Not sure why the circuit was designed that way but it is.