I've been curious for awhile whether the Master Volume mod I did on my Vibrolux back in 1985 was sucking the life out of my amp. I put the MV in using the old Craig Anderton article from that era which back in the day seemed like a really cool idea if you wanted to get your Fender amp to work like a Marshall amp. Have to say I was never really crazy about the sound of an overdriven Fender preamp section but I wrote the experience off as a learning experience, left the MV on 10, and went my merry way. Recently I read a poster thread in which they indicated that their MV mod made their Fender amp kind of flat sounding and lifeless and I have to admit, my 81 has been sounding like that in comparison to several new amps I have picked up along the way. So with that in mind I pulled the assembly and caps and rewired the amp back to the original state. You know what...it sounds a lot better. More touch sensitivity, more lively I would say. I am not sure that just because you can, you should when it comes to amp mods. Truthfully, when I hear before and after comparisons on YouTube, rarely do I think there was a dramatic improvement. Just slapping a mod into an amp which is not overall designed around the mod may not make sense. In this case, glad I reversed the process.