You have been awarded today's stupid idiot of the day award.
Let's take a look at this post shall we.
Quoted for prosperity
The lead channel is damn good also big thick and with good tubes and speakers in my amp not muddy......if you get it mess around with some different tubes...its amazing how much you can change this amp with 12ax7s......it's classic marshall!
Hrm well. Well, let's get the obvious one out of the way first and then we can move on to why this entire post is a jumble of mouth drool.
Tsl602. Classic Marshall.
Tell me mmjohn, which classic marshall is this amp based on? Is it the venerable JTM45? Is it the JMP50? JMP100? The baby 18 watter? Well it couldn't be any of those amps could it. None of those amps have master volumes...
Which classic era of Marshall tones does your TSL602 cover?? The fully cranked WHO through a full stack of greenback era?
Well no. The TSL602 has nothing in common with those amps.
Let's get something straight here folks. There is no such thing as a classic marshall or a classic fender sound that comes out of a circuit with a master volume. None. All of the old rock classics that Marshall and Fender staked their reputation on were non master volume amps that derived most of their distortion from the power amp stage. FACT. 1 million percent fact.
Unless your amp comes with a switch that takes the master volume out of the circuit you are not getting those tones. Your amp is absolutely not getting the right mix of preamp and power amp distortion.
So now the second point. A 12ax7 is a preamp tube. Some sound different then others. Unfortunately, when you're going for tone that is biased heavily towards power tube distortion which 12ax7 you have isn't going to make that big of a difference as long as it's not terribad. We're talking 1 or 2 12ax7 gain stages in most of the big Marshalls here. When you get into 4-6 gain stages you're preamp tube choices will matter a shit load.
Classic Marshall? not so much.
mmjohn you join the ranks of Blues Jr., great classic fender cleans, used for dream theater guy.