ADC P ()
A model name that turns up in passing but never shows itself.
Overview
Collectors mention the ADC P now and then. It shows up in old ads and in footnotes, always without detail. Service manuals, catalogs and decades of audio journals turn up nothing. If the ADC P ever existed as a distinct phono cartridge from Audio Dynamics Corporation, it left no trace worth finding. There are no specs, no reviews, and no ads with a clear image or description. The official lineage of ADC cartridges has no mention of it alongside the 26, the 303A, or the PSX-10.
ADC cartridges ran on high compliance, low distortion, and model names built from numbers, not letters. The "P" doesn't fit. It isn't a variant suffix seen on other models, and it doesn't appear in any known ADC product matrix. There's no evidence it was a prototype, a rebranded export model, or a custom OEM version. The name appears in search contexts, but only as a fragment. It may have been a misprint, a misremembered model number, or a placeholder that never made it to production.
No spec sheet, box or patent drawing has surfaced, so the ADC P is neither disproven nor confirmed. Even obscure cartridges like the ADC 10E Mk.IV have service diagrams and user reports.
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