A front end mosfet that selfbiases to the middle of the load line, 2SK214

By opening up Vicky's non working (muted) Sony ST-S100L FM stereo tuner a lovely 2SK214 was found just after the antenna circuit. Looking up the datasheet, similarty to 2SK170 was found and in addition Vgs=0 is in the middle of the characteristic curves! How would a Pleiades one transistor microphone front end preamplifier would sound like, open gate? How would the fabulous Le Passific - Hiraga, Walthers RIAA MM record cartridge pramplifier sound with the 2SK241?