I'm thinking the LS846 might be the "best" of the currently available options. The reissued 2n3819's appear to be of a different spec than the originals. (Possibly hearsay.) The 2SK170's have too large input capacitance.
The
RusselTech KM84 project has a breakdown of 4 or 5 different FETs and the corresponding drain resistor value. One guy, "Gord" found the LS846 to bias at a value closest to the original Neumann at 3.6k. I realize this might be an amateurish conclusion, but I decided to buy a lot of the LS846's.
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Problem is, they're sold in minimum qty of 10 at 5.06 ea. plus tax and
I don't need 10.
Anyone in the US want to take 5 of them and split the cost, please let me know. $29.88 would get 5 of them shipped to you.
PS, Banzai, thanks for the tips on how the capacitor values affect the bass response.