Lewm,
Back in the day, I had a Sansui Quad system. A QXR 7001. That 100K load was to be use when playing those 4 channel records. The 100K load setting was not needed nor used if you were using it to listen to 2 channel recordings. When playing these 4 channel records, you would switch in what was call a 4 channel demodulater which would load the cartridge with a 100K load. The pre-amp was pre-set at the normal 47K so when listening to normal stereo 2 channel records, you would just not switch in the demodulater. The 4 channel Shibata stylus would improve anything heard or recorded under the standard recording format of the day. No requirement was ever stated that it had to be only used at 100K. To have done so would have only limited their sales and that is the last thing someone trying to sell something would want to do.
Regards,
Back in the day, I had a Sansui Quad system. A QXR 7001. That 100K load was to be use when playing those 4 channel records. The 100K load setting was not needed nor used if you were using it to listen to 2 channel recordings. When playing these 4 channel records, you would switch in what was call a 4 channel demodulater which would load the cartridge with a 100K load. The pre-amp was pre-set at the normal 47K so when listening to normal stereo 2 channel records, you would just not switch in the demodulater. The 4 channel Shibata stylus would improve anything heard or recorded under the standard recording format of the day. No requirement was ever stated that it had to be only used at 100K. To have done so would have only limited their sales and that is the last thing someone trying to sell something would want to do.
Regards,