The Record Clamp “R” Version from Michell Engineering embodies the expertise of a British manufacturer that has shaped analog playback for over fifty years. Designed specifically for turntable spindles from 5 to 6.4 mm, this record clamp is far more than a simple accessory: it is a key component for optimizing the sound reproduction of your vinyl records.
John Michell, founder of Michell Engineering, created in the 1970s what would become the very first record clamp for turntables. Although initially deemed insufficiently significant by the UK Patent Office, this invention has since been adopted by the entire industry. The “R” Version, identifiable by its distinctive marking, represents the specific adaptation of this technology for Rega turntables and older Thorens models, whose center spindle dimensions are particular.
Its operating principle is based on a clamping mechanism. Unlike simple stabilizing weights, this active system applies controlled pressure to the record via the rotation of the anodized aluminum top knob. The deeper bore of this “R” version allows it to fit perfectly on short, straight spindles, whereas the standard model would require at least 6.5 mm of spindle available above the record.
The construction combines two carefully selected materials: black Delrin for the main body and anodized aluminum for the control knob. Delrin, the trade name for polyoxymethylene (POM), offers outstanding mechanical properties that make it a preferred material for this application. Its high stiffness, comparable to certain metals, comes with a significantly lower density, thereby limiting the load on the turntable bearing. This engineering resin also offers excellent dimensional stability and exceptional wear resistance, ensuring consistent performance over time.
Modern vinyl records, often thin and flexible, frequently exhibit warps that compromise playback quality. These undulations, whether concave or convex, create areas where the record does not rest evenly on the platter. This situation generates unwanted resonances as the stylus tracks those unsupported sections, degrading sound fidelity.
The Record Clamp “R” Version addresses these issues by firmly pressing the record against the platter. This mechanical action levels out unwanted warps and eliminates air gaps between the vinyl and the platter surface. The resulting reduction in the vinyl material’s inherent resonances translates into a noticeable improvement in sound precision, with better detail definition and increased stability of the stereo image.
The device’s effectiveness is particularly evident on records with minor to moderate warps. Height variations of a few millimeters, common on many current and older pressings, are effectively compensated. The system also stabilizes records during playback, eliminating any risk of slippage—especially beneficial when using cleaning brushes or on direct-drive turntables that generate high torque.
The hallmark of this “R” version is its optimized compatibility for turntables whose spindle protrudes only a limited height above the record. Rega turntables, known for their particularly short spindles, unequivocally require this specific version. Michell’s standard model, designed for spindles of at least 6.5 mm, would not clamp properly on these decks.
Owners of older Thorens turntables also benefit from this adaptation. The historic models from the Swiss brand, unlike the modern versions, featured shorter spindles requiring this specific format. The compatibility range, spanning from 5 mm to 6.4 mm, thus covers a wide spectrum of classic and contemporary turntables.
This versatility theoretically extends to longer spindles, as the increased bore depth does not impose a strict upper limitation. Nevertheless, for turntables with spindles significantly exceeding 6.5 mm, the standard model remains recommended to ensure optimal grip and ideal pressure distribution.
Measure the available height of the straight spindle above a record placed on your turntable. If this dimension is between 5 and 6.4 mm, the “R” version is essential. Beyond 6.5 mm, choose the standard model, which will offer a better grip. For Rega turntables and older Thorens models, the “R” version is always required.
The Record Clamp effectively addresses minor to moderate warps. For severe warps exceeding 4–5 mm in amplitude, effectiveness is limited. In such extreme cases, pre-flattening solutions may be necessary before optimizing playback with the clamp.
No, the Record Clamp operates exclusively by clamping onto smooth spindles. No modification to your turntable is required. The pinch mechanism adapts directly to the existing spindle, making installation immediate and reversible.
You can expect lower background noise, better bass definition, and increased precision in spatial imaging. As the vinyl’s micro-resonances are damped, playback gains clarity and dynamics, particularly noticeable on acoustic recordings and complex passages.
The clamp’s thickness is negligible compared to that of the record, so the impact on VTA remains minimal. On turntables with adjustable arm height, a fine adjustment can further optimize playback parameters, but it is generally unnecessary.
Since the additional weight is supported by the spindle and not by the record itself, no change to tracking force is required. Your cartridge settings remain the same; the clamp acts solely to stabilize the medium.
The Record Clamp works with most standard mats. Very thick mats can reduce the available spindle height, potentially requiring a thinner mat to maintain sufficient clamp grip on the spindle.
Freddy
Lightweight platter suitable for all turntables with a sufficiently long spindle (not Rega!).
Comment from July 15, 2024 — Experience from July 04, 2024
