TUBE or S/S Phono Amp with an all s/s system?

The typical rule of thumb is that the input impedance of a device should be at least 10 times the output impedance of the device connecting to it. If the Krell has a 47k input inpedance then the Phono preamp should be less than 4700 ohms. This is amazingly high and I don't remember seeing any preamp with an output inpedance even approaching 4700 ohms. You should therefore be OK with any phono preamp that you like sonically. Wally

Underwoodwally...cool name. Thank you, this is good to know.
DOGPILE

Hey John, wanna sell? Thanks for your advice.

I'm happy with what I've got at the moment. However, I often see the ARC PH-3 for sale on Audiogon at reasonable prices.

There is no simple answer... much depends upon your system. Since you're into Krell now, you've got a certain sound to your system (which in this case depends upon the vintage of your Krells).

You could pick a phono preamp based on a desired coloration, or you could just get a Krell front end. Some of their phone stages were pretty good actually.

Much depends upon your turntable/arm/cartridge combo too.

I'd lose the Grado myself... to me Grados are always midrange heavy and lack top and bottom. Shure, on the other hand is all top and bottom, and no mids (just an historical reference). A nice MC would be the thing - then the phono preamp would start to really matter.

Personally, I'd prefer a good Audio Technica or Dennon cartridge over the Grado (even improved as they are these days).

Ymmv. These are only my opinions... strictly subjective.