Here are the FJA Mods...
Standard mods My standard mods are my bottom line price to get inside that particular model amp and make circuit changes. While I do have a mod in mind based on customer feedback on that model, my mods are all adjusted to fit your needs and change the amp in the ways you need it changed.
My standard Vintage Modern mod gives the amp a meatier tone with strong crunchy mids that cut thru. I offer several options for gain levels and voicing.
Two channel mod The Vintage Modern is essentially a Plexi circuit with a PPIMV (post phase inverter master volume). On the VM instead of 4 input jacks Marshall gives you one so you don't have to jump them like everyone did with the Plexi. The Detail channel is the bright channel and the Body channel is your normal channel and you mix them to get your overall tone. I find the Detail too bright and the Body too dark and I can't find a mix I like. Many people have asked me about making the volume levels between the high/low range dynamics closer so they were more usable as 2 channels. My two channel mod offers this. I modify each channel so they bost have a good mix of Plexi tones. The Body channel works the same and becomes the low range channel. The Detail becomes the high range channel and I add a master volume to this channel. The PPIMV still functions like it alwasy did. This gives you a low gain Plexi tone and a higher gain Plexi/JCM800 tone with volumes that can be matched. This mod involves drilling a new hole in the front of the amp (pics above).
X-treme metal mod This mod combines the two channel mod with adding an extra gain stage for over the top gain levels on the high range channel.
Solo Boost As you probably already know running a boost in the loop doesn't work on this amp. I can add a foot switchable solo boost to the VM. This mod involves drilling a new hole in the front of the amp and one on the back for the foot switch.
Added gain stage Adds an extra tube gain stage to increase the overall gain of the amp.
Added choke Installing a choke in an amp that doesn't have one can improve the bottom end punch, sustain, feel, and noise levels. The Vintage Modern amp doesn't come with a choke from the factory.