I think this would make a snazzy preamp myself, perhaps using the 2sk389/2sj109 as input jfets instead, er and remove the 500 ohm resistors....
[img width=121 height=150 alt=GRFE]http://www.head-case.org/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=2349&g2_serialNumber=2&g2_GALLERYSID=07294709821172ddd05f5fcbe96431fa