Marshall JCM2000 amps when ageing tend to have the main printed circuit board start to become slightly conductive and bias to the EL34 output valves becomes unstable or goes very high and cannot be adjusted. This results in high valve anode current which cooks or wrecks the output valves.
This kit totally fixes this issue without the need for replacing the whole main circuit board. If you know how to use a soldering iron and know how to work on a circuit board then this is an easy upgrade. Some expertise in soldering is needed to install this board. If you are not sure get an amp tech to fit the board
This Marshall JCM2000 kit consists of a little printed circuit board with full instructions and picture on how to fit the road and saves on replacing the whole main board.
This version is designed for the TSL series. There is a version for the Marshall JCM2000 DSL series too. The kits are stocked and posted from the UK.
We have fitted this kit in a Marshall amp ourselves and it completely solved the cooking output valves problem.
The product is supplied with the board, adhesive stand offs to mount the board, and full step by step picture and written instructions. This is not an official Marshall kit but was developed to solve a common issue with this amp series.
There is special drill bit needed to drill the printed circuit board and this is included with the kit. Price includes post and is sent 2nd class. We ship this kit worldwide.
The manual was updated on 13th June 2018.
You should consider replacing your EL34’s as they will likely be worn due to overheating. We stock JJ, EHX and tung Sol EL34’s in a number of variants.