Exciting News for Marshall JCM2000 Owners

We’re thrilled to announce the upcoming release of a replacement main board for the iconic Marshall JCM2000 amp series, including the DSL50, DSL100, TSL100, and TSL122. Sign up here to stay posted as they become available, and read on for more details about this rocking amp upgrade.

Why You Need 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 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.

Upgraded Features

• Optimized PCB Track Placement: Eliminates all paths shared by high-voltage and bias circuits to prevent interference
• 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.
• 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

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 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.

Get notified when this product becomes available

Stay tuned for pricing updates and availability. 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.

If you’d like to be among the first to get your hands on this exciting upgrade, please join our JCM2000 PCB Board mailing list. Unlike these amps, it’s low volume, and you can unsubscribe at any time.

Note

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