Musical fidelity M6SI problem.

Well, everything is broken in now and I'm really happy with this amp. Even the phono stage is good, and not one problem. 

I missed this note.  Glad to hear you are happy.  It is a heck of a good amp.  I do think the M6 phono stage is a big step up but if you are happy with what you have...awesome!

Yes it is, and thanks for getting back to me. Based on your reply I am interested in getting a better phono stage, but I'm not sure which yet. The M6 is one option. 

The M6x is going to be available soon and it's supposed to be even better. At first I didn't think much of the phono stage in the amp, but after switching the phono interconnects and breaking it in for many hours I'm surprised at how good it is. I'm used to listening to the phono stage in my CAT preamp, which is really good, and I have a MOFI Ultradeck +m  turntable, so I want a good phono preamp but it has to be a good match for the amp and the MM cartridge. I'm not using a MC .

I can't say I have ever spent time with a MOFI table.  The M6x is very flexible and should be a good match with most cartridges.  It is also fully balanced and that is a huge benefit with MF in the M6 range.  You almost always get the most out of MF gear when the signal chain is fully balanced.