Uni-Vibe Wet Dry Dial MOD!

[Big Monk]

or this area of a vibe circuit? the output mix mod

That’ll slightly maximize phasing but won’t change the intensity of the Preamp.

 

[nznat]

That’ll slightly maximize phasing but won’t change the intensity of the Preamp.

be a good place to start. what do you suggest in my original schematic i sent , where to put changes?

 

[Big Monk]

 

[nznat]

change those resisters to what rating you think?

 

[Big Monk]

The problem is that the larger you make the trimmer the harder it is to get precise changes.

91k/20k Trimmer/91k will give the most precise adjustments.

 

[nznat]

you mean change both 100k resisters to 91K, and add a 20K trimmer pot. how will that increase throb? just trying to get my head around that part. sort of seeing it

 

[Big Monk]

you mean change both 100k resisters to 91K, and add a 20K trimmer pot. how will that increase throb? just trying to get my head around that part. sort of seeing it

So basically maximum phasing occurs when the dry and phased signal cancel out exactly in the mixer.*

*Cancel out is probably incorrect semantically. You don’t want the dry signal or phased signal with a higher gain that’s the other so you are trying to zero out any delta between the two.

So you have a resistor at the output feeding one lug of the trimmer and a resistor off the phase output feeding the other, with the wiper sent to the volume control.

By varying the values of the mixer resistors with the trimmer, you find the null point and therefore the strongest phase tone you have.

It’s a bit subtle but it does work.

 

[nznat]

im not sure how where the three pins of the trimmer pot go after i change the resisters

 

[Big Monk]

im not sure how where the three pins of the trimmer pot go after i change the resisters

 

[nznat]

View attachment 47920

thaNKS A lot. ill give it a go.

 

[phi1]

Big Monk is killing it. I was about to say something similar, but with 47k/100k pot/47k. That would be more range, but big monks method of more fine tuning might work better. So play around with it. You could also try 75k/50k pot/75k. The idea is that at the center of the pot, it comes out to 100k/100k.

 

[nznat]

Big Monk is killing it. I was about to say something similar, but with 47k/100k pot/47k. That would be more range, but big monks method of more fine tuning might work better. So play around with it. You could also try 75k/50k pot/75k. The idea is that at the center of the pot, it comes out to 100k/100k.

so this is not a type of bias mod for bulb, completely different area eh. As i have a bias mod and it made a huge difference at getting a better throb. Yet here, my only goal is to have the entire vibe circuit and effect come forward more wet and sort of over shadow the output, slightly. just jump up more, will bring out more vibe effect?

 

[Big Monk]

so this is not a type of bias mod for bulb, completely different area eh. As i have a bias mod and it made a huge difference at getting a better throb. Yet here, my only goal is to have the entire vibe circuit and effect come forward more wet and sort of over shadow the output, slightly. just jump up more, will bring out more vibe effect?

It will help slightly to add a touch more depth. Not a crazy amount, though.

This is sort of a 1% fine tuning modification. It might be a good idea to just tack it in, find the best sound then solder in the two equivalent fixed resistor values.

I’m still not sure your desire squares with reality here. Then again, I could just be fundamentally misunderstanding what you are after.

 

[nznat]

It will help slightly to add a touch more depth. Not a crazy amount, though.

This is sort of a 1% fine tuning modification. It might be a good idea to just tack it in, find the best sound then solder in the two equivalent fixed resistor values.

I’m still not sure your desire squares with reality here. Then again, I could just be fundamentally misunderstanding what you are after.

oh all good. any adjustment with throb on vibes is a good mod. My vibe has a really nice balance of preamp and throb, but i feel a little bit more depth would be nice. its a bit of perfection / obsession going on, but results have been good so far. ill post a video and audio result over next few days.