Hi Lohanimal: The old Yamaha HA-2 (1979) and HA-3 (1982) were also of this type.
http://jp.yamaha.com/products/audio-visual/special/hifi-history/other/
The HA-2 shipped with a dedicated headshell with two embedded JFETs, thereby bringing the front end of the phono stage forward so that it was less than an inch away from the cartridge. No modifications to the tonearm were required; the tonearm wiring could be used as-is.
http://audio-heritage.jp/YAMAHA/etc/ha-3.html
The HA-3 exchanged the dedicated headshell for a compact encapsulated block that contained two JFETs, had 4 short leads coming in and four short leads going out, and was secured with double-sided adhesive tape. The user could thereby install the JFET block into his favorite tonearm or headshell. Again, no tonearm modifications were necessary.
http://www7.ocn.ne.jp/~mai-k/analogue/transe1/yamaha.html
In more recent years, the prolific Japanese DIY amplifier designer Akihito Kaneta (Kaneda) has published at least one phono amplifier design which installs a JFET headamp inside the tonearm headshell.
kind regards, jonathan
http://jp.yamaha.com/products/audio-visual/special/hifi-history/other/
The HA-2 shipped with a dedicated headshell with two embedded JFETs, thereby bringing the front end of the phono stage forward so that it was less than an inch away from the cartridge. No modifications to the tonearm were required; the tonearm wiring could be used as-is.
http://audio-heritage.jp/YAMAHA/etc/ha-3.html
The HA-3 exchanged the dedicated headshell for a compact encapsulated block that contained two JFETs, had 4 short leads coming in and four short leads going out, and was secured with double-sided adhesive tape. The user could thereby install the JFET block into his favorite tonearm or headshell. Again, no tonearm modifications were necessary.
http://www7.ocn.ne.jp/~mai-k/analogue/transe1/yamaha.html
In more recent years, the prolific Japanese DIY amplifier designer Akihito Kaneta (Kaneda) has published at least one phono amplifier design which installs a JFET headamp inside the tonearm headshell.
kind regards, jonathan