Turntable Troubleshooting

Almost every turntable problem is one of eight faults, and most of them cost nothing to fix. The trick is to start from what you are hearing rather than from a theory about what might be broken. Find your symptom below and work down its list in order — the causes are ranked by how often they are the answer.

Symptom: a constant hum or buzz

1. The ground wire is not connected. This is the answer perhaps three times out of four. Turntables have a thin separate wire ending in a spade connector, which must attach to the ground post on your phono preamp, amplifier or receiver. Without it you get a loud mains hum.
2. The ground is connected but the connection is poor. Loosen the post, reseat the spade properly, tighten.
3. A power adapter is sitting on the signal cables. Wall warts radiate. Move them apart and see if it changes.
4. Something electrical nearby. A dimmer switch, a fridge compressor, a laptop charger. Move the deck or try a different socket.
5. A cartridge lead has come loose. An unconnected ground pin at the cartridge end produces hum from one channel specifically.

If the hum only appears when you touch something metal, that is a grounding path problem, not interference — go back to step one.

Symptom: the sound is very quiet, thin and tinny

This one has a single cause: there is no phono preamp in the chain.

A cartridge outputs a few thousandths of a volt, and the signal also needs the RIAA equalization curve reversed. Without a phono stage you hear a faint, bass-less version of the music. Nothing is broken.

The fix: switch your turntable’s built-in preamp on if it has one (look for a PHONO/LINE switch on the back), or use your amplifier’s phono input, or add a separate phono stage. To work out which applies to your gear, see do I need a phono preamp?

Symptom: distorted, harsh and far too loud

The opposite fault: two phono preamps in series. The signal is being amplified and equalized twice.

Usually it is a turntable with its internal preamp switched on, plugged into a dedicated phono input on an amplifier. Set the turntable to LINE, or move the cable to a line/aux input. Exactly one phono stage in the chain, no more.

Symptom: the record skips

1. Tracking force too low.The most common cause, and counter-intuitive if you assumed lighter was safer. Set it to the value the cartridge manufacturer specifies — see how to set up a cartridge.
2. Anti-skate wrong. Should be roughly equal to the tracking force. Set far too high, it pulls the arm outward hard enough to jump grooves.
3. The deck is not level. Check front to back and side to side with a spirit level, including a phone app. A slope biases the arm.
4. Dirty record or dirty stylus.Debris in the groove lifts the tip. Clean both — see cleaning.
5. Vibration reaching the deck. Footfall on a suspended floor, or the speakers themselves. If it skips only when the music is loud, that is acoustic feedback: move the turntable away from the speakers.
6. Damage. If it skips at exactly the same point on one record only, the record is scratched. Nothing to fix.

Symptom: one channel is missing or weak

1. Swap the RCA cables at the amplifier.If the dead channel moves to the other side, the fault is upstream — the turntable, the cable, or the cartridge. If it stays put, the fault is the amplifier or the speaker.
2. Check the cartridge lead wires. Those four tiny clips work loose, and one detached clip kills exactly one channel.
3. Reseat every RCA plug. A partly-inserted plug is a classic intermittent one-channel fault.
4. Check speaker cables at both ends. A stray strand or a loose binding post.
5. Check azimuth. A cartridge tilted well off vertical can cause a real channel imbalance, though rarely a complete dropout.

Symptom: the pitch is wrong or wavers

1. Wrong speed selected. A 45 played at 33 is unmistakable once you consider it.
2. The belt is stretched, dirty or slipping.On a belt-drive deck this is the usual cause of running slow. Belts are consumables — replace every few years, and clean the pulley and platter rim with isopropyl on a cloth while you are in there.
3. The belt is on the wrong pulley step. On decks that change speed by moving the belt, it may simply be on the 45 step.
4. Pitch control off center. On direct-drive decks with a pitch fader, check it is at zero.
5. Something is fouling the platter. A dust cover hinge, a stray cable, a mat catching the plinth.

Symptom: harsh sibilance, or distortion only on loud passages

This is a tracking problem, not an amplifier problem. In order:

1. Tracking force below specification. Re-balance the arm and set it properly.
2. Alignment off.If the distortion worsens toward the middle of a side, the stylus is not tangent where it should be — re-do the alignment with a protractor.
3. Worn stylus. Hardened sibilance is a classic wear symptom. See how to replace a turntable stylus.
4. Anti-skate at zero. Uneven groove-wall pressure distorts one channel first.
5. Phono stage gain too high.Clipping produces gritty distortion on peaks that vanishes in quiet passages — see gain and impedance.

Symptom: boomy, muddy bass or a low howl at volume

This is acoustic feedback: sound from the speakers is reaching the turntable through the air or the furniture, being picked up by the cartridge, and going round again. It rarely howls dramatically in a domestic system — it usually just makes everything sound thick and indistinct at higher volumes.

1. Move the turntable away from the speakers, and never between them.
2. Put the deck on a rigid, heavy surface, not a flexible shelf.
3. Use isolation feet, or a paving slab under a light deck.
4. Close the dust cover, or open it fully — a half-open cover resonates.
5. If the problem is footfall, wall-mount the shelf.

Symptom: excessive crackle and pops

1. Dust and static. Brush the record before every play with a carbon-fiber brush. This alone removes most of it.
2. The record needs a wet clean.Fingerprints and ground-in grime need fluid — see cleaning kits.
3. Dirty stylus. Brush it back to front every few plays.
4. Dry air. Static is far worse in winter with the heating on. An anti-static brush is the practical fix.
5. Actual damage. A click at the same point every rotation is a scratch. Cleaning will not help.

When it is not the turntable

Two useful sanity checks before you take anything apart. First, play a different source through the same amplifier and speakers — if the problem is there too, the turntable is innocent. Second, play a different record; a surprising number of “my turntable is broken” problems are one bad pressing.

And if the deck is new to you and nothing sounds right at all, work through the setup guide from the beginning rather than chasing symptoms. Most faults on this page are a setup step that was never done.