That was probably several decades ago. The IGBT has drive characteristics like a MOSFET and I personally haven't seen any JLH topology amps using MOSFETs.
J Linsley-Hood designed a power amplifier with Toshiba complementary IGBTs. The Toshiba parts are now long gone. He also designed a number of amplifiers with MOSFETs including one that used MOSFETs exclusively.
The term "complementary" in data sheets sends me into a cynicism coma.
The reason the JLH and QC designs sound good is exactly because NPN and PNP are not electrically complementary. Electricity is not symmetrical. Holes are not positively charged electrons. Yet symmetrical schematic diagrams are hailed. Like Commodus, it vexes me. I am terribly vexed.
The reason the JLH and QC designs sound good is exactly because NPN and PNP are not electrically complementary. Electricity is not symmetrical. Holes are not positively charged electrons. Yet symmetrical schematic diagrams are hailed. Like Commodus, it vexes me. I am terribly vexed.
Last edited:
JLH MOSFET: https://www.diyaudio.com/community/...-from-wireless-world-1982.361257/post-6616739
Complementary output stage.
Complementary output stage.