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.
A Marshall JCM900 100 Watt Combo arrived in the workshop. This version is the 4102 It was very poorly. The first issues seen were : 10 amp fuse in the plug!! Low power output and VERY loud mains hum Pots noisy Amp plays a dying gasp when amp switched off Pops / crackles and very low volume. The valves were tested on an AVO MkII and CT160 tester. The preamp valves were down to a lot
Note: We now have a new, superior solution to Marshall JCM2000 bias drift issues. Find the details here. The early (1997-2003) Marshall JCM2000 DSL50, DSL100, TSL100 and TSL122 amps are often troubled by an unstable bias (drifting bias). These are nice amps and I have one myself This can be difficult to diagnose correctly, as it can take half an hour or more of testing and/or playing before this Marshall JCM200 bias drift shows up.
We have now upgraded all our JJ EL34 valve kits. Our kits now include the JJ EL34 II. The reason? The JJ standard EL34 does not sound nearly as good as the EL34 II . The standard EL34 is known for sounding “thin” whereas the EL34 II has much stronger low end and mids making for a much fatter solid tone. All the EL34 kits on the drop down menu when selecting ” Make” and
The phase splitter valve while it is a pre-amp type valve is really not part of the pre-amp chain at all. It is actually part of the output stage. When an amp has two or more valves then it operates in a mode called push pull. Its job is to invert the signal so that one of your two output valves is driven at any one time. This is a an oversimplified description but I
Phase Splitter Valves they do influence your amp tone Read More »
A Marshall JCM900 amp arrived. The JCM900 combo is basically a 100 watt twin 12 inch speaker combo and is a true Marshall stack in a matchbox. Nice and easy to transport. When new these amps supplied in two variants, with one having 4x EL34’s in the output and the other variant having slightly lower power with 4x 5881’s. This amp was dead. Zero output and a lovely hum. Inside the amp proudly displayed
