Thanks to this fantastic community, I just finished build for my son couple of U87, using SYT bodies (just got them before Jenny's move), Dany's blue PCM, Cinemag 13113, one with a SYT supplied capsule and one with Soliloqueen Capsule. They both work out of the bench, apart the fig.8 of the chineses capsule, probably due to lack of bacplate insulation. I am not trained to appreciate differences, will let this to my son who is completing his training as sound engineer and has planned an A/B/C with a Neumann u87. Again thanks to all !
Now my question. I have assembled the PCB with a low IDSS 2N3819 (8mA), orienting the FET as in the serigraphy, also looking at the build example on Dany's site. By looking at the datasheet IC pinout and the schematics of the board, it seems to me that the 2N3819 is wired with source and drain reversed. Option 1: I read wrongly the schematics Option 2: the circuit works also with the reverse wiring. From my crude knowledge of JFET manufacturing, this can also be the case; the only real impacting change from wiring a 2N3819 in reverse should be the differences in Gate-Source vs Gate-Drain capacitance. I ahve also read somewhere that for the 2N3819 the CGD is higher that GGS, contrary to most JFETs, but I couldn't confirm. Any thougths appreciated.