Proper turntable speed adjustment starts with a question most guides skip: Is the speed actually incorrect, and by how much? A turntable that plays too fast makes vocals sound thin and songs end prematurely; one that plays too slowly drags and sounds flat. Measure first, find the cause, and only then use a screwdriver. This guide, part of our turntable setup guides, explores all three.
Key takeaways
- Measure your actual RPM using a strobe light, phone app, or stopwatch before beginning any turntable speed adjustment.
- A wrong replacement belt is the prime suspect for speed issues on older vintage turntables.
- Always perform your turntable speed adjustment with a record on the platter, after letting the deck warm up for 10 to 15 minutes.
How much does the speed error matter?
Speed error affects both pitch and duration. The values below are calculated from the speed ratio and therefore apply to any turntable:
| Measured speed (set to 33⅓) | Error | Pitch shift | A 4:00 song plays in |
|---|---|---|---|
| 33.50 RPM | +0.5 % | about 9 cents sharp | 3:59 |
| 35.40 RPM | +6.2 % | about 104 cents (one semitone) | 3:46 |
| 36.50 RPM | +9.5 % | about 157 cents | 3:39 |
As of 11/2026, a good turntable should be within about 0.5 % of 33⅓ or 45 RPM, a fraction of a semitone. Errors of several percent, which owners regularly measure on cheap and neglected turntables, shift a song a semitone or more. Owners who play along with an instrument or who know a record well notice much smaller errors; one only realized that his new turntable was high-pitched on a song he’d listened to a thousand times. Most owners agree that a steady speed matters more than exactly reaching 33.33.
Step 1: Measure the actual speed
- Time 50 revolutions with a stopwatch using a mark on the label: at 33⅓ that takes 90 seconds, and 100 revolutions take 3 minutes.
- Use a strobe disc with rings of bars under mains lighting or a battery-powered strobe for high accuracy (approx. 0.03 %).
- Check with a phone app like RPM to measure rotation, keeping in mind that some apps read slightly low.
Tip
Center the phone on an upturned glass, a roll of tape, or a record puck over the spindle. An off-center, bar-shaped phone will unbalance a light belt-drive platter and add its own wobble to the reading.
Step 2: Find the cause
Most “wrong speed” problems are not motor faults. Before diving into any turntable speed adjustment, work through these in order:
- The speed switch: Ensure your speed switch matches your 12-inch LP (33⅓) or 7-inch single (45).
- The belt: A thicker replacement belt makes the platter spin faster, while a thinner or stretched belt slows it down.
- How the belt rides: Check that the belt is centered on the pulley step and not rubbing against the speed-change fork or riding up a flange.
- Friction: Lift the belt off and spin the platter by hand; if it stops in under 15 to 20 seconds, clean and lubricate the bearing.
- Mains frequency: Check if an imported AC synchronous deck matches your region’s 50 Hz or 60 Hz standard.
- Burn-in: Complete a 24-hour burn-in on brand-new decks like the Fluance RT80 and RT81 before assuming the speed is wrong.
Watch out
Do not turn the motor’s trim screws to compensate for a slipping, rubbing, or wrong belt. The speed will drift again as the belt warms up or wears, and you will lose the factory reference for when the belt is fixed.
Step 3: Execute the turntable speed adjustment
Successful turntable speed adjustment depends on your deck type, typically utilizing a 1.5 to 1.8 mm flathead screwdriver for belt-drive decks equipped with trimmers (such as the Audio-Technica AT-LP60X or Sony PS-LX310BT).
- Unplug the turntable and remove the mat and platter to locate the 33 and 45 trim holes.
- Refit the platter, mat, and a record, plug it in, select 33⅓, and let it run for 10 to 15 minutes.
- Turn the 33 screw a few degrees at a time while measuring, and allow several seconds for stabilization.
Step 4: Check stability, not just average speed
A turntable can average 33.33 RPM and still waver (wow and flutter), specified as under 0.025 % W.R.M.S. for direct-drive models like the Technics SL-1500C and under 0.25 % for budget belt-drive options like the Audio-Technica AT-LP60X. Rule out cold-deck warm-up periods or off-center pressings before tampering with internal adjustments or finalizing any turntable speed adjustment.
From our listening room
A model case: an app displays 35.4 RPM on an inexpensive belt-drive deck set to 33⅓ (6.2 % fast). Verified by timing 50 revolutions at 84.7 seconds instead of 90, a careful turntable speed adjustment was made by turning the 33 trim screw counterclockwise after 15 minutes of warm-up until readings stabilized.
Turntable speed adjustment – FAQ
Why is my record player playing too fast?
On older decks, the usual causes are an overly thick replacement belt or the belt riding up the pulley; on budget decks, a trim setting that is off from the factory. Check the speed switch and the belt before starting any turntable speed adjustment.
Why is my record player playing too slowly?
Common causes include a belt rubbing against the speed-change fork, a stretched or wrong belt, or a dry or seized platter bearing. Spin the platter by hand without the belt; if it stops quickly, fix the friction problem first.
How can I check turntable speed without a strobe?
Time 50 revolutions with a stopwatch: at 33⅓ RPM, they take exactly 90 seconds. A phone app is faster, but check it once against the stopwatch.
Where are the speed adjustment screws located on a record player?
On most inexpensive belt-drive turntables, they are in two small holes marked 33 and 45 under the platter or on the underside; on some older turntables, next to the motor pulley, under a cover. Use a 1.5 to 1.8 mm flathead screwdriver and turn it gently.
Why does my record player slow down and speed up?
That is wow. First, rule out an off-center record or a cold deck. Then, check for a worn belt, a dirty pulley, or a dry platter bearing. A basic turntable speed adjustment sets the average speed, but it won’t fix wow and flutter issues.
Sources (6)
- Tipton R.: All About Stroboscopes. audioXpress, 2010 (web version 2018, verified 11/2026).
- Canova P.: RPM, turntable speed accuracy app review. TNT-Audio, 2020 (verified 11/2026). [www.tnt-audio.com/sorgenti/rpm_app_e.html](https://www.tnt-audio.com/sorgenti/rpm_app_e.html)
- Fluance: RT80 / RT81 / RT81P turntable manual (no date, verified 11/2026). [www.manualslib.com/manual/3611126/Fluance-Rt80.html](https://www.manualslib.com/manual/3611126/Fluance-Rt80.html)
- Technics: SL-1500C data sheet (no date, verified 11/2026). nubert.de/down/ea/38/f9/1728308350/technics-SL-1500C-datenblatt.pdf
- Audio-Technica: AT-LP60X, specifications (no date, verified 11/2026). [www.audio-technica.com/en-gb/at-lp60x](https://www.audio-technica.com/en-gb/at-lp60x)
- iFixit Answers: Audio Technica LP60 spinning either too fast or too slow, owner answers (no date, verified 11/2026). [www.ifixit.com/Answers/View/527157/Audio-Technica+LP60+spinning+either+too+fast+or+too+slow](https://www.ifixit.com/Answers/View/527157/Audio-Technica+LP60+spinning+either+too+fast+or+too+slow)
