Presence on channel 1 modern settings not working?

[peapod]

I have an old 2 channel dual rectifier,
I'm sure everyone here knows that The following settings are

(channel 1)Green - Vintage/Modern
(channel 1)Orange - Vintage/Modern

(channel 2) Red- Vintage/Modern


I'm quite sure that the presence doesn't work under the modern green and orange. I can obviously tell it's doing something on the vintage and with channel 2 it works on both vintage and modern.

I just tried to call the certified mesa boogie guy in my area and he's telling me that's impossible and I just can't hear the change in tone.

Am I crazy or can this be fixed?

 

[domct203]

I believe that when you channel clone a 2-channel, both channel's presence pots work together. I'm guessing it's in series where one feeds the other.

Hope that helps.

Dom

 

[peapod]

I'm sorry, what does clone mean?

 

[domct203]

It's a slang for the channel style switch usage.

I don't know if you have a manual, if not go download this:

http://www.mesaboogie.com/manuals/2chRecto.pdf

Dom

 

[peapod]

I believe that when you channel clone a 2-channel, both channel's presence pots work together. I'm guessing it's in series where one feeds the other.

Hope that helps.

Dom

yeah I just read that in the manual so I tried turning the other presence knob and it also doesn't do anything.

 

[domct203]

Hmm, that is strange. It might be time for a tech.

Dom

 

[peapod]

Hmm, that is strange. It might be time for a tech.

Dom

Well now the question is if what I'm saying is indeed possible and if it is fixable because the mesa guy around here was telling me that it's impossible and I just can't hear the presence knob working.

 

[ixoye777]

I would take it in and let his ears hear what it is doing.

 

[domct203]

I would take it in and let his ears hear what it is doing.

+1

Dom

 

[mikey383]

The orange channel's presence pot doesn't work when the orange channel is cloned to modern. I don't recall for a fact, and I'm not near my amp to tell you for sure, but I think the red's presence pot is the global presence pot in that setting. The orange channel has it's presence control in the preamp stage in the normal setting. The red channel's is right before the power amp. When you clone the orange to red, it removes the presence control from the preamp.

If your Mesa tech says it's impossible, he's not much of a tech. That's how they work. I'm on my 3rd 2 channel Dual, and they have all worked like this.