33, 45 & 78 RPM.

33, 45 & 78 RPM

WHAT SPEED DOES A RECORD NEED?

You place a record on the turntable, lower the needle, and immediately hear that something is wrong.

A heavy, slow voice? Then the record is probably spinning too slowly.

Does everything sound rushed and unnaturally high? Then the speed is probably too high.

Most turntables offer 33 and 45 revolutions per minute. Some models can also play 78 revolutions. But the size of a record does not always tell you what speed it needs.

A twelve-inch record usually spins at 33⅓ RPM. A seven-inch single often at 45 RPM. Yet there are enough exceptions that you should check first and only then lower the needle.

RPM EXPLAINED

RPM stands for revolutions per minute: the number of full revolutions a record makes in one minute.

At 33⅓ RPM, the record spins approximately 33⅓ times per minute.

At 45 RPM, that is 45 full revolutions.

At 78 RPM, the record spins considerably faster.

The speed determines how fast the recorded information in the groove moves along the stylus. When the chosen speed does not match the recording, both the tempo and the pitch change.

The wrong speed usually does not immediately damage a normal vinyl record. It just sounds completely wrong.

That is different with old 78-rpm records. There, not only the rotation speed is important, but also the material and the type of stylus used.

33⅓ RPM

The speed of 33⅓ RPM is mainly associated with the LP: the long-playing record.

Most modern twelve-inch albums spin at this speed. Thanks to the lower rotation speed and the finer microgroove, relatively much music fits on one side of a record.

A regular LP often contains about fifteen to twenty-five minutes of music per side. The actual playing time depends on the mastering, the volume, the amount of low tones, and the available space.

You will find 33⅓ RPM mainly with:

– Twelve-inch albums
– Double albums
– Some ten-inch records
– Some twelve-inch singles and EPs
– Reissues of older recordings

However, a large record is not automatically a 33⅓-rpm record. Many twelve-inch singles actually spin at 45 RPM.

45 RPM

The speed of 45 RPM is widely used for singles, EPs, and twelve-inch releases where sound quality or volume is important.

The classic seven-inch single usually has one song per side and often a larger center hole. For such a large center hole, a 45-rpm adapter is required on many turntables.

You will find 45 RPM mainly with:

– Seven-inch singles
– Some EPs
– Twelve-inch singles
– Maxi-singles
– Some audiophile album releases
– Albums divided over multiple records

A higher speed means that more groove length moves along the stylus per second. This can offer more room for dynamics and detailing, provided the record and mastering were made for that.

That does not mean that every 45-rpm record automatically sounds better. The quality is also determined by the recording, mastering, pressing, playback equipment, and the condition of the record.

12-INCH AT 45 RPM

A twelve-inch record at 45 RPM is often mistaken for a regular LP.

This happens mainly with maxi-singles, dance releases, and audiophile albums that are divided over two or more records.

When you play such a record at 33⅓ RPM, the music sounds slow, heavy, and low. This can sometimes start surprisingly convincingly, so you only notice that something is wrong when the vocals come on.

Therefore, always check the label and the sleeve.

If it says 45 RPM, then play the record at 45 — regardless of the format.

7-INCH AT 33⅓ RPM

The opposite also exists.

Not every seven-inch record spins at 45 RPM. Some EPs, spoken recordings, flexidiscs, and special releases are recorded for 33⅓ RPM.

A seven-inch format is therefore a clue, not proof.

When nothing is on the label, do not automatically start based on the format. First look for information on the sleeve, the label, or in the official release details.

78 RPM

The 78 RPM designation belongs mainly to records from the first half of the twentieth century.

Many of these records are not made of vinyl, but of a harder and more brittle material that is often called shellac. They generally have wider grooves than modern LPs and singles.

A 78-rpm record therefore requires more than just a turntable that can spin fast enough.

For safe and good playback, you generally need:

– A turntable with a 78 RPM setting
– A suitable 78-rpm stylus
– The correct tracking force for that cartridge or stylus
– Careful handling due to the brittle material
– A suitable cleaning method for the material

Do not automatically use the regular LP stylus with which you play 33⅓- and 45-rpm vinyl.

The grooves of many shellac records are considerably wider. A modern microgroove stylus can sink too deep into the groove, produce a lot of noise, and poorly follow the recording.

Conversely, a wide 78-rpm stylus does not belong in the fine grooves of a modern LP or single.

SHELLAC OR VINYL?

Not every record that spins at 78 RPM is automatically made of shellac. There are also later 78-rpm releases made of vinyl and other materials.

The material partly determines which stylus and cleaning method are suitable.

Shellac records usually feel heavier, stiffer, and more brittle than modern vinyl records. They can crack or break into pieces if dropped.

Do not rely solely on appearance or feel for an unknown old record. Look up the label, catalog number, and estimated production year, or ask a specialist for advice.

Also do not just use the same cleaning fluid as for modern vinyl records. First check whether the product is safe for the specific material.

THE STYLUS MATTERS

For modern 33⅓- and 45-rpm records, a stylus suitable for microgroove vinyl is generally used.

Many old shellac records have a wider standard groove and require a 78-rpm stylus specially designed for that.

A manufacturer may prescribe different stylus sizes for different materials and periods. Therefore, do not choose solely based on the text ‘78 RPM’.

Check:

– What material the record is made of
– What period the record is from
– What type of groove the record has
– Which stylus the manufacturer recommends
– Whether the stylus is compatible with your cartridge

With some cartridge families, you can easily swap the stylus. With other systems, you need to use a separate cartridge or headshell.

Do you regularly play 78-rpm records? Then a separate, clearly marked headshell or cartridge is practical. This prevents you from accidentally using the wrong stylus.

Also read:

STYLUS & CARTRIDGE — When should you replace the needle?

CHECK THE LABEL

The correct speed is often on the center label.

Look for mentions such as:

– 33⅓ RPM
– 33 RPM
– 45 RPM
– 78 RPM
– LP
– EP
– SP

Check both sides. On some releases, the speed is printed in small letters next to the catalog number or rights information.

Nothing on the label? Then check:

– The back of the sleeve
– The spine of the sleeve
– An inner sleeve
– A sticker on the packaging
– The official product information
– Reliable catalog data of the release

For second-hand records, use the catalog number and matrix information to identify the exact pressing.

You can read more about that in:

VINYL DETECTIVE — How do you recognize an original pressing?

LISTEN TO THE CLUES

If you have chosen the wrong speed, you will usually hear it immediately.

A 45-rpm record at 33⅓ RPM:

– Sounds too slow
– Has a lower pitch
– Makes voices heavy and deep
– Clearly changes the tempo

A 33⅓-rpm record at 45 RPM:

– Sounds too fast
– Has a higher pitch
– Makes voices thin and rushed
– Noticeably shortens the playing time

Stop when in doubt, lift the tonearm, and check the record.

Use the sound as a signal that something is wrong, not as the only identification method.

THE 45 ADAPTER

Many seven-inch singles have a large center hole. To place these records centered on a normal turntable spindle, you use a 45-rpm adapter.

Place the adapter around the spindle and then place the single on the turntable.

The adapter does not determine the speed. It only ensures that the record remains correctly centered.

There are also seven-inch singles with a small, normal center hole. They do not need an adapter, but often still spin at 45 RPM.

Therefore, check the speed and center hole separately.

DON’T FORCE THE SPEED

Not every turntable supports all three speeds.

If your turntable only has 33⅓ and 45 RPM, you cannot safely or correctly play a regular 78-rpm record on it.

Do not try to increase the speed with improvised adjustments. Use a turntable that officially supports 78 RPM and combine it with the correct stylus.

On some models, you select 78 RPM with a separate button. On other models, you have to press two speed buttons at the same time or move the drive belt.

Always follow the manual of your turntable for this.

BELT-DRIVE SPEED CHANGE

On some belt-driven turntables, you change the speed manually.

You move the drive belt to a different part of the motor pulley. The different diameter makes the platter spin faster or slower.

Turn off the turntable before moving the belt.

Preferably touch the belt with clean, dry hands and prevent grease from getting on it. After switching, check whether the belt is straight and not twisted.

Other turntables have electronic speed selection. There you do not need to move the belt manually.

SPEED OR SPEED STABILITY?

A record can be set to the correct setting and still sound too slow, too fast, or unstable.

Then it may not be about the chosen speed, but about speed stability.

Pay attention to:

– Does the pitch constantly change?
– Do long piano notes sound unstable?
– Does the platter spin visibly irregularly?
– Is the drive belt loose, dirty, or worn?
– Is the turntable stable and level?
– Is the correct power supply connected?

On some turntables, you can check the speed with a stroboscope pattern or measuring disc. Use the manufacturer's instructions for this.

Do not tinker with internal speed controllers yourself when they are not intended as user settings.

SIZE IS NOT SPEED

The simplest rule of thumb is:

– Twelve-inch album: usually 33⅓ RPM
– Seven-inch single: usually 45 RPM
– Old thick record: possibly 78 RPM

But ‘usually’ is the most important word here.

A twelve-inch record can spin at 45. A seven-inch record may need 33⅓. A 78-rpm record may require different equipment and a different stylus than just a higher speed.

Therefore, never let the format decide alone.

CHECK BEFORE YOU PLAY

Use this order for an unknown record:

1. Look at the center label.

2. Check the sleeve and any stickers.

3. Look up the catalog number when the speed is missing.

4. Determine whether it is modern vinyl or an older material.

5. Choose the correct speed.

6. For 78 RPM, also check the stylus and cartridge.

7. Only then lower the needle.

QUICK GUIDE

Modern twelve-inch LP:

Probably 33⅓ RPM, but check the label.

Seven-inch single:

Probably 45 RPM and sometimes with an adapter.

Twelve-inch single or maxi-single:

Can be 33⅓ or 45 RPM.

Audiophile double LP:

Can be divided at 45 RPM for more space per side.

Old heavy and brittle record:

Possibly 78 RPM and probably requires a special stylus.

No speed indication:

Check the catalog number and exact release before playing.

LET THE RECORD SET THE PACE

A record usually tells you itself how it wants to be played.

Sometimes large on the label. Sometimes small next to the catalog number. And sometimes only after you have identified the exact release.

Do not automatically choose based on format.

Check the speed, use the correct stylus, and handle old materials differently than modern vinyl.

The correct speed lets music sound as it was intended:

not faster, not slower — exactly on time.

KEEP DIGGING.

SJELF.