Shure V15 Type III
A moving-magnet cartridge that Shure's own engineers used as the benchmark their flagship had to beat, and that a generation of critics called the finest cartridge ever made.
Overview
Shure's V15 Type III was good enough that the company kept referring back to it. When Shure developed the V15 Type IV, its engineers described the Type III in their own technical literature as using "a slightly larger diameter shank and an internal solid beryllium rod reinforcement." The older cartridge was the reference point against which the new telescopic shank was measured.
The Type III is a moving-magnet design, and the period press did not hold back. Shure advertising in the hi-fi magazines of the late 1970s repeats the claim that critics called the V-15 Type III "the finest cartridge ever" when it was introduced. That language appeared in HiFi-Stereo (November 1977, p.137), where the same copy also positioned the M95ED as "second only to the V-15 Type III in stereo reproduction." Whether or not you accept the superlative, the pecking order in Shure's lineup was clear. The Type III sat at the top.
The Type III was notable for trackability, meaning its ability to stay in the groove under demanding high-frequency signals without breaking up. Shure's own technical write-up described it as possessing "one of the highest high-frequency trackability of any present-day phono cartridge." It also recommended that on records containing high peak signals the cartridge be played at its maximum recommended tracking force of 1.25 grams to track all signal levels. Owners who ran it lighter got a thinner, more fragile result. Owners who stayed at the 1.25-gram ceiling got the tracking margin the design was built for.
The Type III's stylus was a biradial tip. Shure would later contrast it directly against the hyperelliptical tip introduced on the V15 Type IV. Shure's comparison of the two (Fig. 15 in its 1978 technical paper) framed the hyperelliptical as the newer, lower-distortion shape, with a narrower but longer footprint in the groove wall and a smaller tracing radius. The biradial Type III was the state of the art when it arrived, and the hyperelliptical was the improvement that followed.
Shure also gave the Type III an upgrade path. By 1979 the company was advertising a "Super-Track Plus" family of V15 Type III cartridges fitted with a hyperelliptical tip, pitched as delivering "audibly greater freedom from distortion." This was the HE stylus tip first introduced on the V15 Type IV, packaged as a drop-in improvement for existing Type III owners. The campaign ran across multiple titles, including HiFI-Stereo (October 1979, p.65) and High-Fidelity-Trade-News (September 1979, p.126). A Type III bought in the mid-1970s could be upgraded years later without replacing the body, which is a big reason so many of these bodies are still in service.
The Type III was also cheap enough to be a real-world choice, not just a reviewer's trophy. A period advertisement in Audio (October 1979, p.43) promoted the Super-Track Plus family of V15 Type III cartridges. By the end of the decade, Shure's published pricing put the Type III cartridge at $95.00 with the stylus at $34.00. The wear item is replaceable, and the body survives.
Shure's own trackability analysis showed the cartridge's performance depends heavily on the arm it's mounted in. A resonance between tonearm equivalent mass and cartridge compliance produces a dip in the trackability curve in the warp-signal region below 10 Hz. The company's published example used the Type III in an SME arm at one gram tracking force to show where the margin thins out. Arm mass matters as much as stylus condition on a Type III today.
By its own maker's standards, the Type III was not the last word. Shure's 1978 literature is candid that the Type IV improved on it, with greater high-frequency trackability, a better-behaved bearing material in the sub-audible and mid-frequency ranges, and the hyperelliptical tip. The Type III was the cartridge the Type IV had to beat. It is a high-trackability moving-magnet with a deep replacement-stylus ecosystem and a documented upgrade path.
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