Pickering UV-15
A cartridge line built for discrete four-channel and the 30 kHz signals that came with it.
Overview
The UV-15 was built to solve one specific problem. Discrete four-channel records carried audio in the familiar 20 Hz to 20 kHz range, but also as FM-modulated signals up at 30 kHz. A cartridge that only did stereo well couldn't necessarily trace those high-frequency signals. Pickering's own literature was blunt about it - the discrete system, as the company put it, "requires completely new cartridges." The UV-15 Series was Pickering's answer.
The pitch ran through the company's magazine advertising in the mid-1970s. The line performed "in a superior manner by every test" and was "capable of satisfying all technical and aesthetic requirements for playback of both discrete and stereo discs." As the company's advertising in High-Fidelity (December 1975, p.6) put it, Pickering's cartridges were claimed to feature "low frequency tracking and high frequency tracing ability." That's marketing copy, and Pickering was selling, not testifying. But the engineering claim is specific and checkable in the period advertisements: the UV-15 Series was designed for exceptional high-frequency tracing ability, which is what made discrete playback possible at all. Pickering also said the stylus on UV-15 cartridges was designed to reduce record wear. That matters when a stylus is working harder and riding higher-frequency information than a plain stereo tip.
The series was the discrete-and-stereo counterpart to Pickering's stereo-and-matrix XV-15 line. The XV-15 family topped out at the 1200E for stereo and matrix playback. The UV-15 side of the catalog was the discrete four-channel branch, and it spawned several variants over the years. The best-documented is the UV-15/2400Q, which Pickering described as a completely redesigned cartridge body paired with a new high-performance stylus assembly called the Quadrahedral. The company trademarked the name and leaned on it heavily in its advertising. Per Pickering's own materials, the Quadrahedral stylus featured a "revolutionary new diamond stylus" developed specifically for the discrete application.
The UV-15/2400Q's published specifications, as printed in Pickering's period advertising, show what discrete demanded. Frequency response was quoted as 10 Hz to 50,000 Hz, measured with the cartridge terminated into the recommended load of 100K ohms and 100 pF. That figure only makes sense once you remember the 30 kHz FM carrier. Output was listed at 3.6 mV (±2 dB) referenced to 5.5 cm/sec record velocity. Tracking force was given as a range of 1 to 3 grams, which Pickering noted was the manufacturer's recommendation for optimum performance. A 1-to-3-gram range suggests the cartridge was tolerant of different arms and setups. It also means the user had real latitude to get it wrong, and discrete playback was not forgiving of a misaligned or under-tracked stylus.
The advertising around the UV-15 line leaned on Pickering's Dynamic Coupling Factor rating system, or DCF, which the company claimed was the first quantitative way to identify pickup performance. Pickering's argument was that DCF measured low-frequency tracking ability and also served as an index of high-frequency tracing ability across the 8 to 50 kHz span, which is where discrete four-channel lived. Whether or not one buys DCF as a shopping tool, it reflects the design priority of the UV-15: high-frequency tracing above all. The company's tagline for the whole range, "for those who can hear the difference," was appended to nearly every UV-15 advertisement of the era.
It's worth being clear about what the UV-15 was and wasn't. It was a specialist's cartridge for a format — discrete four-channel — that never became the mainstream. The stereo-and-matrix XV-15 line got top billing in Pickering's "best of both worlds" campaigns, with the 1200E held up as the flagship; the UV-15 discrete cartridges shared the page but served a narrower audience. Collectors and hobbyists today encounter the UV-15 series mostly as period curiosities — cartridges built to a standard the market largely abandoned — and as evidence of how seriously the industry briefly took the quadraphonic challenge. The Quadrahedral stylus assembly and the 50 kHz frequency response are the details that make these worth a second look.
These are period cartridges, and the stylus assemblies are the wear item and the hard-to-source part. That goes double for the specialized Quadrahedral tips. Anyone running one today should inspect the stylus first. Beyond that, the documentary record is thin. The UV-15 series is best understood through Pickering's own advertising and spec sheets rather than independent lab reviews, so owners should expect to rely on the manufacturer's published figures rather than third-party measurement.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.