15k - that's a very nice and juicy number to play with. Two of the greatest phono stages were made in thee 80's the Mares Connoisseur and the Vendetta SCP2A. I have a Vendetta for which I got new IC's on advice of the great designer. John Curl has said in various interviews that the Jfets from back in the day aren't available now. My takeaway is that age shouldn't be a factor or a concern. You need to ask a few retailers if you can audition the phono stage in your system.
