Chris M

Vinyl 101: Parts of a Record Player

In the beginning, there was the phonograph, then came the turntable, today there is the record player. The main difference among these terms is who happens to be uttering the words. ‘Phonograph’ is the oldest term for this analog instrument, dating back to the mid-1800s when the concept of a stylus responsive to vibration was first being explored. Back then, the parts of a record player were different.

On a victrola, a horn was fixed near a vibrating stylus that amplified the noise with simple acoustics - like a horn to your ear as a hearing aid. Remember that even today, putting your ear near a record while a stylus is tracking reveals that it’s transcribing what’s in the record groove acoustically (in addition to electrically).

‘Phonograph’ remained the mainstay until ‘turntable’ entered the picture. This was somewhere near the time when folks started building component systems as the industry learned that there was much more to explore in the way of sound quality. The nature of the audio system changed when the principle of amplification moved from acoustic to electrical.

Enter audio receivers (amplifiers & preamplifiers with tuners & built-in phono preamps), loudspeakers, audio signal-carrying RCA cables & speaker wire as well as a slew of options among phono cartridges and styli. Here we also entered the era of the vinyl ‘Microgroove’ record as the audio community had begun to move away from shellac-coated 78rpm discs – the beginning of the audiophile era as we know it. As it remains today, ‘turntable’ was a way to describe the record-playing portion of a Hi-Fi component system.

The latest and current generation of vinyl record enthusiasts understands the term ‘record player.’ Acknowledging that this dates yours truly, more than once I’ve been met with a blank stare in response to using the word ‘turntable,’ followed by the quiet inquiry, “…you mean record player?”  To this day, ‘phonograph,’ ‘turntable,’ and ‘record player’ are all active terms and we’re all speaking the same language (at least generally). No one’s right and no one’s wrong here. I say ‘turntable’ because that is the generation from whence I came.

I digress… we are, after all, here to discuss the basics of the modern turntable. I find it helpful to start from the ground up…

Parts of a Record Player: Isolation Feet

…so let’s begin with isolation feet. It’s hugely important to understand that the impact of vibration & resonance on your turntable goes well beyond the skipping of the stylus in the groove. As an example, when you play your music, your speakers resonate everywhere (including on the floor and up the walls!). The more effectively you can separate your turntable from any and all external low-frequency vibration & resonance, the better it will sound. The feet that support the turntable are therefore significant, particularly for folks who don’t want to bother with the likes of fancy audiophile racks, platforms, and so on.

A good isolation foot usually implements some sort of spring and/or damping material (such as TPE and various types of rubber). Such a foot is good at absorbing resonance coming up from under the turntable. Another tried & true foot is the classic conical one, known in the plural as spike feet. These minimize the contact surface between your record player and the surface on which it rests, disallowing a good amount of vibration & resonance to travel upward. There are many combinations of these designs as well as plenty more ‘sophisticated’ approaches out there. Try upping your isolation for better sound. You’ll hear it in varying degrees in your playback’s clarity, spatial awareness, and low-level detail.

Parts of a Record Player: Plinth

The feet support the plinth, otherwise referred to as the turntable base or platform. Mass & solidity are paramount here. A hollow hunk of plastic serving as a plinth will resonate internally, regardless of how well you isolate the turntable. A plinth that’s optimized to give you the best sound will typically be solid (not hollow or minimally hollow) and will be made of something resonance-absorbing, resonance-dispersing, or some combination of the two.

MDF and other off-shoots of wood are typically good and keep production costs low. As plinth isolation gets more involved, many turntable makers aim to disperse and/or eliminate unwanted resonance a) through uniquely shaped plinths and/or b) by eliminating as much of the plinth as possible. Many audiophile turntables on the market lack a conventional chassis for this reason. Where there is a plinth, keep in mind that resonance not inherently bad. Some materials and combinations of materials are used specifically because of the way they resonate (their resonant frequency). The idea, though, is that resonance is controlled and deliberate.

Parts of a Record Player: Drive System

Next, we move to what’s usually mounted to the plinth: the direct drive system. The conversation regarding belt vs. direct drive is a big one that we will save for another day, but suffice it to say that a direct drive turntable uses a motor that drives the turntable platter directly, i.e., the motor & platter are coupled. We will focus today on the belt-drive system, which is widely agreed to be capable of better sonic performance (again, there are no absolutes – there are damn good direct drives out there).

There are a couple of reasons the belt drive system is most common these days: a) in the consumer range, it keeps costs down and b) in the vinyl aficionado range, it de-couples the motor from the record platter. The belt (usually some sort of rubber) is what drives the platter, so motor noise and/or resonance are isolated from the record-playing surface, amounting to a lower noise floor which in turn makes musical information more available to your ears. Stand-alone motors that are entirely decoupled from the plinth are more effective still.

The quality of the power supply, motor, and motor mounting is also very important. Shortcuts in the development and production of these parts amount to noisier motors that vibrate more, and with lower speed tolerances. Your turntable cartridge, cantilever (the metal rod that houses the diamond), and stylus (some folks say ‘turntable needle’) are highly sensitive and will only amplify unwanted noise.

Parts of a Record Player: Platter

Now we move on to the platter – that which rotates atop the drive system. Principles here are similar to that of the plinth. High mass is a good thing (less prone to being affected) and selected materials should be anti-resonant. You’ll find plenty of low mass aluminum platters on the market. When you get a chance, remove a similar platter and give it a rap or two. You’ll hear it ringing, which is far less than ideal if sound quality is your priority. Steel is better because it’s less resonant and more massive, acrylic is acoustically dead.

More advanced platters use various coatings and/or ‘sandwich’ designs that combine materials to affect resonance. The sky is the limit.

Turntable Mats and Slipmats

The turntable mat is of course the last line of defense in terms of isolating your cartridge & stylus from external unwanted vibration & resonance. As with the above, everything under the sun has been at least tried as a record mat. Some mats are meant to couple the record to the platter (to simulate the resonance properties of the platter and/or record itself), or to de-couple (to add another resonance barrier). Since it's in direct contact with your records, which in turn makes contact with your stylus, the record mat can make audible differences in playback.

For the record (no pun intended… seriously), most stocks felt mats are OEM, and their main function is to protect your vinyl from the hard surface underneath. Their greatest value is in peace of mind. They do little in the way of promoting sound quality. Cork turntable mats or rubber slipmats do the most when it comes to dampening.

The Tonearm is Essential

Needless to say, as the carrier of the phono cartridge, the tonearm is instrumental in getting the most from your system. There should be no ‘play’ in the tonearm bearing, meaning basically that tube should not wobble in any direction. Here again, plastic is no good. It resonates and is not rigid. Rigidity in the tonearm structure allows your cartridge to do its best work, unimpeded by vibration & resonance that negatively color the sound. Aluminum & carbon fiber are commonly used materials that are light, rigid, and anti-resonant. Basic elements for pivoted tonearms (most common) are the headshell, armtube, bearing & counterweight.

The headshell (sometimes user-replaceable) is the end-portion of the tonearm to which you mount the cartridge. We recommend a carbon fiber headshell.

The armtube is the prevailing length of the tonearm, longer in curved tonearms. As a general rule, a longer tonearm allows for less ‘error’ in the tonearm’s arc across the disc, yielding cartridge alignment geometry that’s closer to optimal.

The bearing structure is at the pivot point. Its job is to provide secure and fluid lateral movement of the arm. The counterweight is used to balance the cartridge and at an optimal value so that the right amount of VTF (vertical tracking force) is applied to the stylus in the groove. The anti-skate mechanism can take one of several forms, but its task is to offset the inward-directed momentum of the tonearm so that the only force applied to the stylus is vertical force (so that the stylus retrieves information equally from each lateral groove wall).

Phono Cartridges AKA Record Player Needles

The cartridge and stylus are a larger conversation that we will discuss down the road, but let’s briefly go over the basics. Put simply, the stylus (the actual diamond) is responsible for responding to the contours of the record grove. At the opposite end of the cantilever (a metal rod with diamond bonded to it) are magnets and coils that generate an electrical signal based on the motion of the stylus. This principle is known as electromotive force (energy created by motion).

The signal is passively sent to the cartridge output pins to which the tonearm lead wires are connected. The tonearm lead wires carry the signal through the arm, out the turntable jacks (usually RCA), and over to the phono preamp. Moving magnet & moving coil are the two main types of phono cartridge. If a cartridge has a replacement stylus that you can swap out yourself, you can usually infer it’s a moving magnet. If the stylus is not user-replaceable, it’s a moving coil in most cases.

Keep Dust Away With a Dust Cover

Last, atop the whole machine, you’ll usually find the dust cover (some record players don’t accommodate a proper cover). Its main utility is just as its name suggests; it’s a cover that protects your gear from dust. Of course, one should use it for its practical function and/or maybe aesthetics, but it’s best to remove it or to leave it open (if hinged) while listening. The dust cover is a known resonator – it creates a cavern over your turntable, like listening to your vinyl collection inside a cave.

Feeling Like an Expert?

We hope you’ve enjoyed our overview of record player parts & principles. Indeed your CD player or MP3 player might offer a bit more convenience, but we love the notion that listening to vinyl forces you to engage more with an album proper. Truly it’s a different listening experience entirely. Turntable parts can be a lot to consider, and as always, we advise you to engage with your collection to the extent that’s best for you as the listener. The main priority is that you’re having fun. Some folks will dive in deep and make a hobby of it (or even a profession!), others will spin records from their kitchen countertop while washing dishes. What matters is that it brings you joy.

Happy listening!

by Chris M