Hi,

The QSK on the TS-590 is actually quite quiet unless you are running 
it through something like the ARB704 relay box to isolate it from a 
linear amp or through an external antenna tuner that has relay 
protection.  Check menu 53 and set it to 0.  You'll be surprised at 
how quiet QSK is.  I use an ARB704 and an MFJ998 and the QSK can be 
pretty daunting.  I wear headphones when operating partly to get 
around the QSK noise, but the noise isn't from the TS-590, it's from 
the relays in other equipment.  I used a Tentec Omni for years and it 
was an excellent QSK rig, but I don't think it's keying relay was any 
quieter than the one in the TS-590 when Menu 53 is set to 0.

73,

Dave, W7OQ