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THORENS TD125 NEW SPEED CONTROL BOARD – DROP-IN REPLACEMENTDescriptionNOTE: Although it says ‘used’ this is abrand new boardassembled by the seller and connected to a Thorens turntable for testing and adjustment.
This is a brand-new speed-control circuit board for a Thorens TD125 MkII which gives 16/33/45rpm OR 33/45/78 speeds. Please specify which you require.16/33/45is the original factory specification.
MkI boards(16/33/45 only) are also available FOR AN EXTRA 15 – see below*
I’ve owned a number of TD125s over the years and they have nearly all had temperamental speed control. This is not too surprising because the turntables are now around 50-years-old! The electrolytic capacitors, transistors, sliders, lamp, op-amps,solder connections and printed circuit board can all give trouble but just about anything on the board can fail, making fault-finding tricky and frustrating.
I developed the new speed-board as a labour of love to get my current cranky oldThorens working. Its circuit board had multiple problems so I decided to design a complete replacement for assembly in my own workshop. I originally developed the board for the TD125 Mk2 but I have since modifed the design to work with the Mk1 which has a different motor and transformer.
Producing the new board was long process partly because of the completely redesigned switching system.The newmechanism uses microswitchesin place of the troublesome sliding metal contacts. This means none of the old board has to be salvaged for the new board.I have successfully made more than a dozenboards so far.
It is a drop-in replacement for the old board and is bolted in the same place as the original board. The speed control lever works the same as does the fine speed-adjustment knob.It is a very careful re-design of the original board. It uses the same Wein bridge oscillator circuit but the circuit board has been reconfigured with updated components. For instance, the new smd transistors are superior and reliable compared to the originals which are easy to overload and damage.
The re-designed printed-circuit board was professionallyfabricated.
The structural components used with the board were very carefully designed using CAD and are professionally printed using SLS technology. I paid particular attention to the complex sliding partso as toachieve a very precise, robust and hard-wearing mechanism.
All the new owner has to do is unsolder the 8 wires attached to the original board and resolder them to the new board.
Full instructions (with photos) included.
What you get is a fully working speed control board which has been connected up to one of my ownturntables and adjusted. Only minor further tweaking should be needed in another TD125.
A short video of the turntable running at 78rpm can be found here:https://youtu.be/DWBg6KjEtYo
Recent feedback from buyers of the speed board:An excellent transaction, with a highly recommended eBayer. Thanks very much.Very high quality. Working perfectly.Excellent high quality board. Good instructions, fantastic support. Thank you!Excellent item and service. Many thanks.’Your initial set up was spot on as I needed to make no further adjustments to speed other than a slight nudge to the above deck speed control. Speed remained dead on all weekend with no tweaks necessary.Thanks again for making this board available. It is definitely a fine replacement for the original. If I ever come across anyone needing a board repair for their Thorens 125, I will highly recommend they obtain one of these.’
Buy with confidence – see my feedback!
Please message me about shipping costs if you live abroad.
NOTE – THERE IS A 2-WEEK LEAD TIME FOR MAKING THE BOARDS
*Mk1 boards are more expensive because they are supplied with areplacement transformer. This is because the old transformer on the Mk1 is the wrong rating for the new board. The new transformer is ready-wired to the board and just has to be soldered to the connection-board in place of the wires fom the old one. Please message me if you would like further details of the Mk1 board.
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Category: Sound and Vision:Home Audio and HiFi Separates:Record Players/Turntables
Location: Abergele, Conwy