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.
The ROS -2000 board is our upgraded, UK-made PCB for the valve board in Marshall JCM2000 DSL 50, DSL 100, and TSL 100/122 amps. We ship these worldwide, and the board comes with full instructions. A picture is worth a thousand words, so here is a 14-minute video explaining the key features of our design. Rowan Diskin, board designer of Keld Ampworks walks through the details and the reasons for how the design was implemented. Check
[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 and valve failure issues. Find the details here. Marshall JCM2000 DSL100 Tube Damage Cascading Events following an EL34 valve /tube failure This Marshall JCM2000 DSL100 tube damage results in a number of failures – all caused by a Marshall branded EL34. The valve had short circuited. The EL34 was a TAD EL34 and these were supplied to TAD I believe from
A Marshall JPM 50 arrives in the workshop. This blog covers this Marshall JPM50 Re-Commission. This Marshall JPM50 Amp is from the classic era of pre-1973 Marshall amps. It is therefore highly desirable when fully operational. The Marshall JTM50 on its last period of production, was re-branded as the Marshall JPM50. The amp went though final test at Marshall on 13th June. 1972. This is the highly desirable lead model from one of the
Note: We now have a new, superior solution to Marshall JCM2000 hum, noise, and bias drift issues. Find the details here. Marshall JCM2000 DSL100 Hum after warmup fix There are a couple of key problems with the Marshall DSL can TSL series printed circuit boards. One is the drifting bias due to board leaking current. This causes the EL34 output valves to overheat,We sell Stable bias board kits for the DSL and the
