Thorens TD-124 (1957–1967)

Name: Thorens TD-124
Brand: Thorens

A Swiss transcription motor built like a watch movement and a bank vault at the same time - the idler-drive turntable that broadcast studios trusted and audiophiles still fight over.

Overview

The TD-124 is a turntable. That needs saying because the model turns up in the wrong catalogs - filed under amplifiers, listed alongside preamps, described by sellers who clearly never lifted one. It isn't an amplifier. It's a four-speed belt-idler-drive transcription turntable from the Swiss manufacturer Thorens, introduced in 1957 and produced, by the main record, between 1957 and 1967. It has a separate motor unit, a heavy cast plinth, and an idler wheel that has to be maintained to keep spinning records the way it should.

Owners describe the TD-124 in almost religious terms, and the reputation was earned rather than marketed. It was revered for its precision engineering, sturdy build, and exceptional sound quality. It earned that standing in professional broadcast, including major European radio stations, where a turntable that drifted or rumbled got pulled from the studio. The design emphasized mechanical isolation, precision engineering, and long-term reliability. Six decades on, those are exactly what decide whether a surviving example is a joy or a doorstop.

The drive arrangement is the heart of the thing. Thorens used an external motor with idler wheel coupling - a belt/idler wheel drive in the period's own language - rather than a direct-drive motor bolted under the platter. The separate motor unit minimized vibration transmission into the platter and arm. The heavy, resonance-resistant plinth was made from cast phenolic material, a dense thermoset that soaked up energy. The idler-wheel system requires maintenance, but it delivered remarkably consistent platter rotation. The TD-124 rewards the owner who services it and punishes the one who doesn't.

The platter is a two-part affair - a heavy die-cast aluminum platter with a separate non-magnetic aluminum top shell and clutch arrangement, so the record can be held stationary while the platter keeps spinning and then released to full speed instantly. Audio (December 1961, p.55) walked through the mechanism in detail. It noted the heavy-duty induction motor isolated on rubber shock mounts and driving the speed-selecting idler through a flexible belt, an arrangement the magazine said prevented the motor from imparting unwanted rotational or vibrational motion. The same review measured total rumble 31 dB below a 1-kHz reference and flutter at 0.08 percent, and called the deck "in a class by itself."

Key Features

Separate Motor Unit with Idler Coupling

The motor lives apart from the platter and arm, coupled through a belt and idler rather than mounted directly beneath the record. That separation is why the TD-124 runs as quiet as it does. The motor is a precision Swiss AC synchronous unit in the main record, though period documentation describes an AC 4-pole induction motor, and the two descriptions don't fully reconcile. Either way, the motor is isolated, and the belt-and-idler chain is the isolation. It also means the drive is serviceable in a way direct-drive motors aren't. Belts and idlers are consumables, and consumables can be replaced.

Four Speeds, Mechanically Switched

The TD-124 came with a choice of speeds - 16, 33, 45, and 78 rpm - mechanically switched, with a variable-speed trim of roughly ±3 percent. That four-speed coverage made it one of the very few turntables of its day that could handle everything from a 16-rpm transcription disc to a 78, and it's a large part of why broadcasters and archivists gravitated to it. The speed selection is mechanical, not electronic, so it either works cleanly or it doesn't. When it doesn't, the fix is a cleaning and a switch replacement, not a service manual full of logic chips.

Two-Part Platter with Clutch

The platter is heavy die-cast aluminum with a separate non-magnetic aluminum top shell and a clutch between the two. The lower platter carries the flywheel mass. The upper shell holds the record and can be decoupled so the disc sits still while the platter spins. That's the cueing trick - place the stylus precisely, release the clutch, and the record is instantly at speed. The main record lists the platter as heavy die-cast aluminum; Artisan Fidelity describes a 12-inch, 11.5-pound table with a separate non-magnetic aluminum shell cover. The sources conflict on platter diameter and weight, so treat the exact figures as approximate.

Cast Phenolic Plinth

The plinth is solid cast phenolic resin - a dense, resonance-resistant thermoset rather than the plywood or MDF most decks used. It's heavy and stable, and it keeps energy out of the platter and arm. It's also the part most likely to show its age cosmetically, and the part collectors most want original.

No Tonearm Included

Thorens shipped the TD-124 without a tonearm. The deck was sold as a platform, and the buyer chose the arm. The main record lists optional SME, Thorens TP 120, or TP 16 with SME mounting. Period practice ran to the ESL 1000 Gyro Balance, the Ortofon RMG 212, and the SME 3012, and restorations today commonly carry SME 3009s. The arm-mounting board is removable, which makes re-arming a straightforward job rather than a machining project.

Voltage Flexibility

The deck operates at any voltage from 100 to 250 volts, 50/60 Hz AC, so it suited studios on both sides of the Atlantic. The external motor control unit handles speed selection, keeping the switching and the motor's electrical environment away from the platter.

Historical Context

The TD-124 emerged during a golden era of analog audio and was used for decades in countless broadcast studios around the world, meeting what the period literature called the most exacting demands of broadcasting. Its durability and performance specifications were said to exceed NAB standards for studio equipment. One period listing called it the Rolls-Royce of transcription motors and noted it was as solidly made as the Garrard 301 and 401.

The main record credits the TD-124 with laying the groundwork for later high-end Thorens models, naming the TD-124 II and the TD-150 as the family that followed. Whether that lineage is direct or simply reputational, the deck sits at the head of Thorens' postwar high-end line, and its influence shows in the isolation-and-mass thinking behind the company's later suspended designs.

Collectibility & Value

The TD-124 ranks 9 out of 10 on the collectibility scale. Fully restored units with original or high-end aftermarket tonearms such as SME command between $1,500 and $4,000 or more. Unrestored but complete units in good structural condition typically sell for $800 - $1,500, reflecting the investment required for proper refurbishment. Original boxes, manuals, and accessories further enhance value.

The live market is noisier than the article range suggests. eBay completed sales show a high of $2,550, a median of $810, a low of $15, and a latest of $1,197 at roughly three sales a month. Individual asking prices run higher - a restored example listed at €2,500, a record player at $3,300, and one seller asking $4,999 for a personal unit. Asking prices and completed sales are different things, and the spread is wide enough that buyers should weigh condition and originality over the headline number.

What goes wrong is well documented. The rubber idler wheel hardens or cracks over time, and replacement with a modern recast wheel is typically necessary. The motor may develop bearing noise or speed inconsistencies, restorable with cleaning, lubrication, or bearing replacement. The idler mechanism and motor want a specific grease - synthetic or silicone-based - to run smoothly and stay quiet. Aging capacitors in the power supply or motor control unit should be replaced. Rubber parts in the motor coupling and idler assembly need regular inspection, and proper leveling and platter mat condition are essential. The main record recommends having a TD-124 serviced by a technician experienced with vintage Thorens turntables, and notes that originality is highly valued - preserving factory components where possible increases both collectibility and resale. Replacement parts are available: motor suspension spring sets, stainless or aluminum speed control switches, non-magnetic replacement platters, and rubber "mushroom" grommets all turn up from specialist suppliers.