Hiss at addition in system LAMM L2

Interesting about the mosfets.

I owned a Moscode 401HR amp that used mosfets. It's a high gain amp, and I can't say I heard any appreciable hiss.

Not arguing your point. Just making an observation.

I had BAT Rex in my system recently, paired with BAT 75-SE, and it was "dead silent"- I could only hear very low level ground loop- type cycling humm with my ear literally 1" from the tweeter, which I'm positive, was related to my power lines, rather then Pre/Amp themselves.
So, I guess hiss is a byproduct of less, then perfect design, and not inherent to tubes or mosfets for that matter.

Considering the bad user experiences and opinions being
expressed, I suppose there'll be a glut of used L2 Reference preamps in the
listings soon. Mine won't be one of them, however.

It might be helpful to know the sensitivity of everyone's speakers who are
experiencing excessive hiss with the L2 Reference. Mine are 93dB, and as I've
already written, the hiss is normal, IMO, and certainly within the range of hiss
I've heard in my system in several iterations with other gear and speakers
(89dB).

I have had a few iterations where there was zero hiss...and I mean none. The
amps were NuForce, Bel Canto, and Leben. Preamp was Atma-Sphere.
However, none of the systems were as musically satisfying as the one I have
presently.

Just for reference, I had the lamm pre in a system with Coincident Total Victory, Revel Studio and Verity Parsifal. There was some degree of small hissing with all but none really annoying except one combo: Coincicent TV with Antique Sound Labs 1009 60 watt monos. The hiss was very audible.
I had a 200 watt Edge NL 10 in that system that was fairly silent, surprising considering the power difference.
Currently the Lamm M1.1 are paired with the Verity and the hiss is only audible if you put your ear to the tweeter.
So in my experience it appears to be a amp gain speaker sensitivity issue.
The lamm pre is the longest surviving component in my system and is the last one that will leave.

My system:
Mark Levinson ML-390S
Preamplifiers LAMM L 2
amplifiers LAMM M 1.2
Dunlavey SC-V
Purist Audio
I always thought, that Preamplifiers and amplifiers one manufacturer
Will well incorporate …
However hisses strongly … even on distance 15.
Can change L 2 on LL 2???
What Preamplifiers LAMM L 2 or LL 2 hisses less??