Jelco TK 850S Tonearm for Thorens


Take the performance of your classic Thorens to the next level by adding a contemporary arm with contemporary wiring.  This upgrade kit allows easy installation of the newly introduced Jelco TK-850S tonearm.  Note there is NO drilling, grinding, or cutting the metal subchassis involved! The Jelco 850S is a drop in fit.

Note: For your safety, owners of 14X models with auto-shut off should seek a qualified professional to defeat and circumvent the auto-shut off. The rest of the modification is very DIY.


1 Jelco TK-850S tonearm in original packing, new, with headshell

1 Custom DIN Cable, new, 1.2 meter, retail $129

1 Solid aluminum armboard, new,  with hardware to attach arm and armboard, retail $59. The silver (clear anodized) version will be supplied unless otherwise specified.



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SKU: Jelco TK 850S Categories: , ,


The Jelco 850S, new to the market in January 2018, is Jelco’s venture into higher end tonearms, but continuing their philosophy of exceptional value.  Unlike their previous arms, this features a knife edge bearing made of superior steel which contributes to very stable and smooth operation. This knife edge is precision handmade and the result is very low friction. It features a universal headshell design and a counterweight that can account for cartridges in a very wide weight range. Like other Jelco arms, this leans on the side of being heavy in mass.

The included custom cable, sourced from the UK, is specifically designed for suspended decks. It features Mogami Mini Starquad Tonearm cable, an angled DIN connector and Starline RCAs. It also has dual grounding. I’ve been using this cable for two years on all of my Jelco arms; it’s an exceptional cable, and it’s included at this price! Most angled DIN tonearm cables made today are too thick/stiff for suspended decks.

The US-made Jelco armboards are ONE PIECE of high quality machined aluminum, brushed and anodized.   Check out the exceptional fit and finish using the magnifier. They look amazing.   Included with your armboard are three stainless steel screws for attaching the plate to the table. You can use the existing Jelco nuts/washers to attach the arm with three shortened screws I provide.

From Jelco:

“9 inch Static balance tape with headshell

Design Hi-Mass type system, and different kind metal material used for antivibration, it has a very low gravity and excellent sound created from this
tonearm geometry allows for Bearwald alignments which is IEC recommended
universal type counter weight from 17 to 35 g with headshell installed

knife Edge bearing

This knife edge material is specifically made super steel and has a very stable and smooth operation. This knife edge is precision handmade and the result is to have a very low friction

Universal type counterweight

This Very unique structure of counterweight is to set lighter to heavier cartridges without having to change the counterweight itself”

Additional information

Weight64 oz
Dimensions16 × 6 × 6 in