Opinions on CJ Sonographe SA 400

I own this amp and enjoy it except for one thing. In a very, very, quiet room I can hear the amps transformer hum softly from my listening chair when no music is playing. Just wondering if you notice this with your amp. I had a Sonographe SA-120 before the SA-400, and it was dead quiet.

Hi,

I have SA 400 for 5 years now, and also had problems with
tranformer hum, but I always assumed that main reason for this is european 50Hz mains vs 60Hz in states.
Amp chasis is pretty large and amplify transformer hum so I deadened it by two strategicaly placed wooden rods inside. All hum is gone!

In 5yrs period I've listened to a lot of other amps and always returning to my modified PV10AL and SA-400.
Musicaly wise is really bargain.

Other equipment: CD player:Arcam Alpha 9 (modified),
Speakers: Sonus Faber Concerto Grand Piano and JMLab Micro Utopia, Cables from QED and Nordost