To compliment the written instructions for fitting our ROS-2000 boards to Marshall JCM-2000 DSL50/100 and TSL100/122 amps, we have a video showing the steps. You can download the fitting instructions on this link. The following video walks you through the design features of our board Check out the product and order here We ship worldwide.
[Updated 9th March 2026] We’re thrilled to announce the upcoming release in March 2026 of a replacement main board for the iconic Marshall JCM2000 amp series, including the DSL50, DSL100, TSL100, and TSL122.
Note: We now have a new, superior solution to Marshall JCM2000 bias drift issues. Find the details here. I have now worked on two Marshall JCM2000 amps and both are around 10 years old. Both had very similar faults. The fault on both was that the amps sounded “rubbish” and both were cooking the EL34 output valves. Instead of running at about 45 mA of bias current the lowest adjustment you could achieve was over
