Quietest amp you ever owned ?


A few years ago I had the little Antique Sound Labs MG SI 15 DT integrated and was impressed how quiet it was; in other words with the amp on and no music playing it was dead quiet when I put my ear right up to the drivers on the speaker. I am curious what other amps out there are as dead quiet since most amps have a slight hum or hiss that can be heard when music is not playing. At the time I was using Coincident Conquest speakers which are pretty efficient.
bobgates
I just changed over to balanced cables on my Spectron Digital One and it is absolutely dead quiet all the way to maximum setting on the volume control. But once fed a signal, the dynamics are unbelievable! (I also use Rothwell Electronics line attenuators on the input and Spectron's own Zobel networks on the speaker posts).
Singlepower Audio SDS-XLR tube headphone amp. Even through the most sensitive headphones with volume up all the way....Not a peep.
I've heard the Red Wine Audio Signature 30 and have to agree it is extremely quiet. Want to get the newest version of the Antique Sound Labs KT88 single-ended tube amp with remote.
Both my Edge NL12.1 and my Pass X350 were completely silent (but the Pass was HOT HOT HOT; The Edge is barely warm).