Audio-Technica AT-11
Little is documented about the Audio-Technica AT-11. It was a phono cartridge, and it shows up in Audio-Technica's cartridge lineup in a new-products roundup in HiFI-Stereo (April 1973, p.18). That listing rated the AT11 at 15 to 25,000 Hz, with a tracking force beginning around 2 grams. The text cuts off before the full range is given. The sibling AT10 on the same page was rated 20 to 20,000 Hz at 2½ - 4 grams, so the AT11 appears to have been the wider-bandwidth model of the two.
No production years, original price or further specifications have surfaced. The model left little paper trail beyond that first listing. The 15-25,000 Hz rating and the cut-off 2-gram tracking figure are about the only published details to check a mounted one against.
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