Exciting News for Marshall JCM2000 Owners

[Updated 22nd December 2025]

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.

Why Your JCM2000 Needs This Upgrade

Great tone never dies, but unfortunately amp components do.

As beloved as they are, Marshall’s iconic JCM2000 amps are showing their age, and the main PCB often deteriorates due to heat. The most common issue is bias drift, caused by high voltage conduction to the bias circuit. This causes the EL34 output valves (a.k.a. power tubes) to overheat, resulting in premature failure. Unfortunately, there’s no practical way to completely repair these boards, and Marshall no longer provides replacements.

And since these issues are caused by physics, literally every JCM2000 will experience them sooner or later.

But fear not!

Introducing the ROS-2000 Ultimate Solution

We have developed a superior replacement board that preserves the legendary tone of your JCM2000 while adding several key enhancements. The result is a long-lasting, hard-rocking, tone-faithful solution for your JCM2000 amp with reduced noise and improved reliability. Using advanced electronics modeling unavailable at the time of the JCM2000’s original design, we have configured this replacement board to eliminate the issues faced today by ageing JCM2000 PCB boards.

In short, it’s quieter, longer lasting, and more resilient, but still loaded with all the tone mojo you love about your JCM2000 amplifier.

[ 22nd December 2025 Update] We have now kicked off production.    We have retained some surface mount components but these are in areas which are the most unlikely to fail.   The picture shows the first version with tthe surface mount parts.  We have fitted these to amps and they work perfectly.   We are opening the books so you can pre-order from 2pm UK time on the 2nd of January, 2026.

We were concerned at all the tariffs  for our  USA customers. Therefore, we are manufacturing in the UK.  Privcing will appear to be higher for USA only customers because the USA goverment insists that we pay the import duties and customs clearance up front when we ship. Unfortunately these will be added into the shipping cost for the USA 🙁

Upgraded Features

• Optimized PCB Track Placement: Eliminates all paths shared by high-voltage and bias circuits to prevent interference. Heavy duty tracking is used on the board
• PCB Slots: Added to prevent cross-conduction at the valve sockets.
• Uprated DC Heater Diodes: Equipped with 3A rated diodes for enhanced durability
• Discrete Diodes: Replaces the monolithic bridge rectifier to improve airflow around components and for future serviceability.
• Flyback diodes :  To protect the output transformer if speakers not attached.
• Larger Heater Circuit Copper Areas: For improved heat dissipation resulting in better noise control and component life
• High-Quality FR4 Board: Ensures longevity and reliability
• Low Impedance Ground Plane: Reduces noise for a clearer sound
• Enhanced AC Heater Connection Paths: Improves performance and eliminates crosstalk
• Uprated Anode Resistors: From 1/2W to 2W for greater reliability
• Upgraded Film Capacitors: Rated to 630V for improved durability
• 105C temperature rated electrolytic capacitors for improved life expectancy
• Slots in the board to block leakage currents to increase the longevity of the boards

Significant Benefits

• Resolved Preamp Hum: Upgraded 3A diodes in the DC heater reduce heat build-up and eliminate hum caused by PCB conduction
• Noise Reduction: Achieved through a low impedance ground plane and improved AC heater connections
• Enhanced Component Life: Built to last with uprated anode resistors, quality capacitors and a high-quality FR4 board

Easy Installation

• Identical connector numbers and placements ensure seamless integration
• Consistent fixing points for easy setup and minimal hassle
• No soldering required to fit the board.
• We will have a YouTube short video showing how to fit the boards

Let’s bring your beloved Marshall JCM2000 amp back to its full glory with these state-of-the-art replacement boards, available exclusively at Valve Tube Guitar Amps.

Note

Marshall Amplification does not endorse this product. It is an entirely independently developed unit. Marshall JCM2000 is a trademark of Marshall Amplification Ltd.