Hiss at addition in system LAMM L2


Hiss (noise) from speakers at addition in system LAMM L2.

Three weeks ago, I have bought preliminary amplifier L2 reference
Improvement in sounding all system was huge!!!! The overall dynamics and scale of the music!!!
Illusion of a presence(finding) in a concert hall has appeared.

But I am disturbed with the following:
At addition in system L2 strong enough noise (hiss) has appeared from
speakers. At inclusion of toggle-switch MUTE hissing disappears, at deenergizing
Toggle-switch MUTE all room is filled with noise (hiss).
Even at listening music on silent passes or piano music
Such noise level it is normal or L2 demands repair?
anton9005

Showing 1 response by kurt_tank

In response to Tvad's comment:

"I often wonder if some of us are more sensitive to hiss than others, and were we to listen to the same system at the same time if some of us would object to hiss we hear whereas others would not."

Absolutely true.
I am one of those that can not stand hiss, (usually introduced via tubes), that is audible from one's listening position. I have sold all of the tube preamplifiers (and tube phono preamps), that I have tried becasue of this. That eventually led me to use the (solid state) Ayre K-1xe preamplifier, and its phono boards, in order to get as deep, dark blackground as posible. (FYI: I am very happy with the results, and doubt I will ever go back to a tube preamp.)

And what is funny is that I can ignore pops and ticks from records, which is how I listen to 90% of my music, but not low level hiss. (Well, a limited amount of pops and ticks anyway. Too much of course spoils it for me.)

However, I do realize that I like how tubes make the music sound, so I have managed to interject a nice touch of tubes via my Lamm M2.1 monoblocks. They only use one 6922 tube in the driver section of the amp, but it is enough to make the music come alive. (I will state that I use NOS Amperex pinched waist tubes, because I want the absolute best of the tube sound, and since I only need two, the exorbident cost of these tubes is somewhat mitigated.) And yes, it does introduce a very small touch of hiss, audible only by putting one's ear to the speaker, but it's not audible from my listening position.

If you can find that you can live with the hiss, you're probably better off in the long run, as the Lamm L2 reference is a wonderful preamp, and incredible musical, and one of the better preamps around. (Assuming you can live with the hiss, and its lack of a remote, (which was the deal breaker for me).

Good Luck!