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I believe that Roberto is an expert but I was very surprised with his first post in this topic. There are simulation results but there are no schematics 
. This is the first time I saw simulation results without schematics being simulated. And the name of the circuits are custom like "old", "new", "my". So I had to search for Marshall schematics and I found out that in many cases the pot used is either 20k, or 22k (and not 25k). Sometimes the pot tapper is marked as linear but quite often without any designation. I also noticed that the "Y" scale in the simulations is linear - should be rather in decibels if you want to prove your point. Following the same idea (posting simulation results without schematic) here is simulation results of tube amp that that I build (based on Marshall circuit). As you can see, the "Y" scale is logarithmic and the regulation is perfectly linear. I don't know whether it is better then in stock Marshall amps but this is what I use 
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Mark
. This is the first time I saw simulation results without schematics being simulated. And the name of the circuits are custom like "old", "new", "my". So I had to search for Marshall schematics and I found out that in many cases the pot used is either 20k, or 22k (and not 25k). Sometimes the pot tapper is marked as linear but quite often without any designation. I also noticed that the "Y" scale in the simulations is linear - should be rather in decibels if you want to prove your point. Following the same idea (posting simulation results without schematic) here is simulation results of tube amp that that I build (based on Marshall circuit). As you can see, the "Y" scale is logarithmic and the regulation is perfectly linear. I don't know whether it is better then in stock Marshall amps but this is what I use .Mark
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