REWINDLinear tracking turntables explained: the arm that goes straight
A linear tracking turntable moves its tonearm in a straight line across the record, so the stylus stays tangent to the groove from the first track to the last. That removes the tracking-angle error of a pivoted arm. The Technics SL-10, built from 1979 to 1985, brought the design to ordinary living rooms.
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What is a linear tracking turntable?
It is a record player whose tonearm is not pivoted at one end. Instead the arm, or a small carriage holding the cartridge, moves along a straight path that follows the radius of the disc. People also call it a tangential or parallel tracking turntable. Such an arm has no tracking error and no skating force (Wikipedia: Phonograph).
To do that, the arm must creep toward the label at exactly the speed the groove spirals inward. A typical 12-inch LP side at 33⅓ rpm runs 20 to 25 minutes while the groove travels roughly 8 to 9 centimeters toward the center. That works out to about 4 millimeters of arm travel per minute, by our rough arithmetic. It is slow and steady, and technically complicated to get right.
What problem does a pivoted tonearm have?
A pivoted arm swings in an arc. As it sweeps across the record, the angle between the cartridge and the groove changes slightly, and even a small change affects the sound. The second error is skating force: the groove drags the stylus with a force that does not pass through the pivot, which pushes the stylus toward the center. Modern pivoted arms add an anti-skate mechanism, using springs, weights or magnets, to cancel it.
Disc-cutting lathes also move the cutter along a straight radius, which is the argument for copying that path on playback. A pivoted arm can match it only at certain points on the record, and good arm geometry spreads the remaining error out so it stays small. A linear arm has no such compromise.
How does the arm know where to go?
There are two broad answers. High-end designs let the arm ride on a cushion of air, nearly without friction. More affordable designs use a servo: a small motor drives the carriage along a rail, and a sensor watches for sideways deflection of the arm. When the groove nudges the stylus, the sensor tells the motor to catch up (Wikipedia: Phonograph).
Either way, the arm has to move gently so it adds no noise of its own, which is why these decks demand good engineering.
Why was the Technics SL-10 a landmark?
Linear arms existed before it, but they were specialist and costly. The Technics SL-10 changed the picture. It was built from 1979 to 1985 and was the first linear tracking turntable with direct drive, a Technics idea that dated to the 1969 SP-10. The SL-10 article describes a cast aluminum chassis weighing 6.5 kg, the same size as an LP jacket, with no visible arm or big plinth.
It shipped with a low-output moving-coil cartridge, so it included a built-in, bypassable step-up preamp. The cartridge was meant to be replaced as a unit, and the deck accepts any P-mount (T4P) cartridge. The SL-10 and its programmable sibling, the SL-15, spawned a wave of imitators through the 1980s. For the drive side of this story, see belt-drive vs direct-drive turntables.
Pivoted arm or linear arm: how do they compare?
On paper the linear arm wins, but in practice the pivot won. A pivoted arm is a lever on a bearing. A linear one is a machine with a motor, a sensor and a rail, and anything that wears or drifts out of adjustment can cause trouble. That is why the design stayed a specialist corner of the market without ever disappearing.
| Pivoted arm | Linear (tangential) arm | |
|---|---|---|
| Path across the record | An arc | A straight radius |
| Tracking-angle error | Small but always present | None in principle |
| Skating force | Needs anti-skate | None in principle |
| Mechanical complexity | Low | High: rail, servo or air supply |
| Repair and parts | Easy, many standards | Often model-specific |
| Size | Visible arm and plinth | Can fit inside an LP-sized case |
Should you buy one today?
Only with your eyes open. A used deck can sound excellent, but carriage motors, rails and sensors are model-specific, so check that the arm glides smoothly across the whole record and that the controls and speed switch work. Ask for photos or video of a record playing from start to end. The SL-10 left production in 1985, so parts come from used units.
Four checks before you pay:
- Does the carriage travel smoothly across the whole record, with no stutter or hunting near the label?
- Do the speed switch (33 and 45 rpm), start and stop, and arm lift all work?
- Is a replacement cartridge or stylus available? The SL-10, for one, accepts any P-mount (T4P) cartridge.
- Does it track a record you know well without audible distortion near the label?
Can you try a linear tracking deck on your iPhone?
If you like the look and the idea, there is a simpler route. REWIND draws a 1972 turntable with a linear-tracking arm among its 3 vinyl machines, and the arm moves across the record as your own song plays. See vinyl-belt72 and the vinyl record player page. The machine is part of REWIND PRO.
Frequently asked questions
What is a tangential tonearm?
It is a tonearm that moves in a straight line along the record's radius instead of swinging on a pivot. It is another name for a linear tracking arm.
Do linear tracking turntables sound better?
In theory they avoid tracking-angle error and skating force. In practice sound depends on the arm, cartridge and build quality, so a linear deck is not automatically better.
What was the first linear tracking turntable with direct drive?
The Technics SL-10, produced from 1979 to 1985, was the first linear tracking turntable to use direct drive.
Why are linear tracking turntables rare?
They need a rail, a motor and a sensor or air supply to move the arm at the right speed. That complexity made them costlier and harder to repair than a pivoted arm.
Does REWIND have a linear tracking turntable?
Yes. One of REWIND's vinyl machines is a 1972 turntable with a linear-tracking tonearm. The arm moves across the record as your song plays.
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