Trouble is, I don't have the correct paperwork. The D75S just came in the mail, and only makes mention of the stylus size (.0003 X .0028) and output voltage (0.82 mV/cm/sec). It does not list the frequency response or the channel separation.
My D1800-S is in the little cube, and came with no spec sheet.
I remember coming across a spec sheet a while back that stated the frequency response of the D75S was 10-30K, but I can't prove it, because I didn't save it to my computer for future reference.
According to a hi-fi magazine list with specifications and prices of cartridges being sold in Australia in 1984, the specs for the XV-15 1800S were:
Frequency response: 10Hz – 30kHz (no dB limits given)
Channel separation: 35dB @ 1kHz, 25dB @ 10kHz (I suspect that the 10kHz separation was only supplied by the distributors because the magazine requested it for their list, as it wasn’t normally noted in Pickering spec sheets)
Tracking force: 0.5 – 1.5g (somehow I think 0.5g was more wishful thinking than a realistic option!)
Output: 4.4mV @ 1kHz, 5cm/sec record velocity
These were identical to the elliptical XV-15 1200E, by the way – the only differences in all the specs between them were the stylus shape and size.
From what the writer of the Stanton book said, the D75S was actually a stylus replacement for a private label Stanton cartridge. That was possibly something like a private-label Stanton 680EE-S, which was supplied to a turntable manufacturer, or maybe even a record or department store chain.
So it’s probably as hard to find out details about it as it is to find them about specific Shure-made Realistic-brand styli, other than it’s a Stereohedron stylus, which fits the Stanton 680/681 or the Pickering XV-15. The actual specific cartridge it was actually meant to fit is unknown. It should be a good quality stylus though, of similar quality to ones for the genuine cartridges.