Attention K&K phono pre owners:


Kevin has a new major upgrade in the works that applicable to all previous models back to the first kit sold (sold to me and now in the hands of an audio friend). Check out Kevin's posting over on the K&K forum for details. I've been in contact with Kevin for weeks as he has worked to develop this and this should be very exciting. I haven't posted on this before at Kevin's request to keep this under wraps until he was ready for an announcement.
john_tracy
Thanks John...Just got off the phone with Kevin.. some questions on my newly built unit.
Looks like this latest upgrade will be ready in a few days.
Another great upgrade to look forward to from KandK!
What a guy..
I corresponded with Kevin today and he said that he would have everything wrapped up and ready like in the next two weeks. I think the cat got out of the bag a little ahead of schedule for him.
I've got the parts now and I'm planning on spending the weekend upgrading my differential series feed phono pre. Also have on hand the parts to upgrade my buddy's SE phono pre. I plan on tackling that later in the week. I'll post on how it all goes.
I just installed the new plate-load CCS mod and new input FET last night. Initial impressions are extremely favorable. I'll need at least a couple of days to let everything settle and break in after which I'll post more detailed sonic impressions.
Well, I have finally upgraded my 3 stage differential phono pre with only a couple of hiccups. Blowing fuses on turn on that seems to be the result of a weird problem with the power switch and a lack of signal in the left channel. In my hast to finish I neglected to solder one of the connections from the board to the interstage transformer. My bad. In my defense, this upgrade was a little more involved than that of the SE version. Four plate loads, four FETs, replacing 10 MOSFETs in the B+ and cathode "tail" current sources, building a new higher voltage negative choke input supply and a PS mod. As to that PS mod, if you want to make a nice upgrade to your phono pre it will not cost you any money, only some of your time. It involves rewiring the PS choke as a "common mode" choke. You can refer to the Lundahl data sheet for the connections.
http://www.lundahl.se/pdfs/datash/1638.pdf
I was so impressed with the improvement that I have rewired the chokes in my line stage and my mono-blocks to good effect.