Dual Rectifier Presence Issue? (Channel 3 - Vintage Mode)

[realeyesrealize]

Hi everyone,

I just received my first Dual Rectifier (used) and was tinkering around with it today. It sounds awesome, but I noticed that when I'm in Vintage mode on channel 3 the presence knob seems to almost do nothing at all. Unless it's very subtle, I cannot tell the difference between having the presence on 0 and having it on 8. Once I dial it all of the way up, it all of the sudden gets really high sounding. This is very unusual to me. When I switch to Modern mode, I can hear an audible difference as I change the presence. With other amps I've owned (Mark V, Carvin V3, etc), the presence makes a huge difference.

I am wondering if this is how it's supposed to behave or if my amp has an issue. Vintage mode is my favorite, so I'd like it to work perfectly. I'm just curious if others notice the same behavior as I'm having trouble finding anything online describing this.

Thanks to anyone that can help!

 

[screamingdaisy]

The amp is optimized around channel 2 (orange) being in vintage and channel 3 (red) being modern.

Reason being is that modern and vintage modes require different presence circuits with different presence pot values.

When you run channel 3 in vintage it's using the modern presence pot value which doesn't do much until you hit the max parts of the sweep.

Long story short, your amp is functioning fine.

 

[realeyesrealize]

Thanks for the reply! Much appreciated. It's just not at all how any other amp I've used has worked. And I noticed in 2010 Mesa supposedly improved the way the presence controls work, so I'm guessing it has something to do with this. Glad to hear that the amp is working normally though. Thanks again!

 

[screamingdaisy]

Thanks for the reply! Much appreciated. It's just not at all how any other amp I've used has worked. And I noticed in 2010 Mesa supposedly improved the way the presence controls work, so I'm guessing it has something to do with this. Glad to hear that the amp is working normally though. Thanks again!

In 2010 they added a stacked presence pot on each high gain channel, so switching modes switches presence pot values.