Phase inverter-how it affects tone

Re: Phase inverter-how it affects tone

Quencho092 said:
how does this affect tone. I want to know about it since the deluxe reverb has 2 of them and a rectifier.


I am confused by your post...it looks like you are saying that a deluxe Reverb has 2 phase inverters, which is NOT true
 
Re: Phase inverter-how it affects tone

Quencho092 said:
2 12AT7 tubes in the phase inverter?


OK...your amp DOES have 2 12AT7's...but only one of them is the phase inverter...the other one is the reverb driver tube. To answer your question about it affecting tone, it doesn't affect it much at all...this tube provides no gain so it's affect on your tone is minimal
 
Re: Phase inverter-how it affects tone

It depends on the amp design. In many Marshalls, the crunch that many attribute to power tube distortion is actually clipping in the PI.
 
Re: Phase inverter-how it affects tone

It is not how much or little crossover distortion it will control, the never ones are more balanced or what ever it is called in english..lol
Sorry my tubeamp knowledge is somewhat rusty;)
 
Re: Phase inverter-how it affects tone

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
 
Re: Phase inverter-how it affects tone

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
 
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Re: Phase inverter-how it affects tone

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

The Fender Authority hath SPOKEN!

(thunderclap)
 
Re: Phase inverter-how it affects tone

Luke Duke said:
The Fender Authority hath SPOKEN!

(thunderclap)

I was just supporting what you said! :laugh2:

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
 
Re: Phase inverter-how it affects tone

Lewguitar said:
I was just supporting what you said! :laugh2:

Lew being you are a year or two older than me and have dealt with Fenders 4 or 5 years longer than me :laugh2: .....(have to gain my composure) I like to think that you are speaking on experience and as an authority...whereas I speak from my ARSE! It's entirely possible that my Z is backwards from the rest of the world. In which case I would be giving opposite directions! I didn't figure so but I know there are those much more knowledgeable than myself.

Luke
 
Re: Phase inverter-how it affects tone

BTW, I believe that PI distortion is the reason that post-PI master volumes retain the amp's tone better than pre-PI MVs.
 
Re: Phase inverter-how it affects tone

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.

The reason is this: even when the master volume is on 10, the 1M master volume pot itself acts like a 1M grid load resistor on the input of the phase invertor tube. Without a master volume control, there is no addtional 1M grid load resistor like that. That's why an amp like that with a master volume sounds differant than the same amp with no master volume....even when it's on 10 it acts like a 1M grid load resistor. I think! :smack:

Lew
 
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