View attachment 2166191 I worked at Pickering/Stanton in Plainview, NY (Long Island) from 1971-1973. John Kuehn was my boss (Chief Engineer). Much of my work was related to the CD4 4-channel cartridges (XV-15/1200E). CD4 was based on high and base bands. The high band went to 40KHz. Getting a mechanical stylus to vibrate that fast with a flat response was quite difficult. The CD4 project was Walter Stanton's baby and he hovered over me every day waiting for results. In those days all cartridge design was based on progress testing. Build something, test it, make a change and test again. Walter always told me "Only change one thing at a time." I heard that 10+ times a day.
I still have one of the XV-15/1200E CD4 cartridges and 2 of the test records that we used. After frequency response testing successful cartridges were audibly tested with these records with 4 of the electrostatic speakers in each corner of the listening room. We must have played the same 1 or 2 cuts 100's of times. The cartridge in the original box is in the center of the attached photo sitting in our curio cabinet.
The Pickering and Stanton cartridges were built on the same production lines and were very similar in design. The higher quality cartridges were built in Plainview and the lower end in Freeport, NY (about 14 miles away). We also marketed a dynamic headphone and turntable. We did engineering samples of electrostatic speakers and headphones. I still have one of the electrostatic headphones. It operated around 3000V and I am afraid to try it after all those years - the insulation may have broken down.