Line Magnetic owners...how quiet are they?

I'm an LM dealer, and have sold quite a few of the 518's.  Not had one yet with any hum issues.

FYI-- The 518 has hum balance adjusters on it, so if you do pick up any hum, you can try and adjust it out.

The whole LM line is really pretty awesome, with the 211, 518 and the all new 508 being the most popular units for me.

Ha...just noticed that the original post is from 2014....imagine that the OP has done something by now!  lol

I have a LM 216ia and I really luv it. It has been my first tube amp. It is very quiet. It is as quiet as my ss amp.

518IA is a sweet amp, swapped in NOS tubes except for the 845s, very musical, holds bias well, no hum issues whatsoever. 

I had a LM-216ia. It was not quiet -- it had an audible hum with my Focal Aria 936's and eventually sold it because I could not stand the hum.

I also put it on a scope and measured it. The amp had low THD, but the noise was on the order or a few mV. The transformers had a resonance around 250kHz, which manifested itself in a lot of ringing and overshoot when I tested the amp with square waves.

My take on Line Magnetic is: their amps look cool, but I really did not like their transformers and the humming.