Quencho092
New member
how does this affect tone. I want to know about it since the deluxe reverb has 2 of them and a rectifier.
Quencho092 said:how does this affect tone. I want to know about it since the deluxe reverb has 2 of them and a rectifier.
Quencho092 said:2 12AT7 tubes in the phase inverter?
aleclee said:It depends on the amp design. In many Marshalls, the crunch that many attribute to power tube distortion is actually clipping in the PI.
JCM800s IIRC.the guy who invented fire said:Which MArshalls are you talking about?
Lewguitar said:The type of tube does affect the tone.
In a Deluxe Reverb a 12at7 will cause the amp to have a cleaner, less grainy tone than a 12ax7 tube will. The 12ax7 will have more drive and make getting a ballsier more overdriven tone easier.
Not always the best choice in a DR though. I used 12ax7's for a while in my blackface Fenders and went back to the 12at7 phase invertor after a while.
In a blackface Fender there's a little cap that feeds the input of the phase invertor tube. The value varies and some use .001 and others use .01 or even .02. Changing the value of this cap from .001 to .01 or .02 allows for a ballsier, fuller, more overdriven tone too.
I've gone back to using the standard value in most of my blackface Fenders...but .01 can work well in the louder Fenders like the Super Reverb and Twin Reverb for getting a little breakup at lower volumes.
Lew
Lew
Luke Duke said:The Fender Authority hath SPOKEN!
(thunderclap)
In my Z it adds or takes away a lot of gain. My PI burned out and I replaced it with a 12AT7. It still sounded good but the amp had to be cranked to really breakup. The headroom increases with a lower gain tube.
Luke
Lewguitar said:I was just supporting what you said! :laugh2:
aleclee said:BTW, I believe that PI distortion is the reason that post-PI master volumes retain the amp's tone better than pre-PI MVs.