Hi All,
I'm using a Line6 M13 into my F-50, using the 4 cable method. Basically with Filters, and Distortion models straight into the amp, and Mod/Delay effects in the loop. But, there are 2 things that are happening. With the FX mix knob @ 50%, it sounds like I'm getting some comb filtering. It seems to go away when I'm at minimum, obviously, and at max. But there's also a hum that's coming through. When I run straight from the M13 into the F-50, no loop, no hum. I read through some forums, and it seems that the comb filtering has to do with the A/D/A creating a phase issue, and a loss of volume and tone.
I found a post from a while ago (2005) about modding the F-50 FX loop from parallel to serial. The poster is referring to Mesa Support:
I called their customer support and they quickly sent me a diagram on the change to the mix pot wiring, to make the loop serial.
Basically there are three wires that go to the three lugs on the mix pot. For the mod, you
-disconnect the 1st wire on the left (looking down onto the pot with the knob pointing down and the lugs up) and connect it to the middle lug (along with the middle wire that is already connected there)
-disconnect the 3rd wire which is on the right
There were some other mods for nomads that were basically the same, but instead of soldering back to the pots, they just disconnected the wires entirely from the pots, jumped wires 1 and 2, and insulated them?
My questions are:
Has anyone done this? Results?
Is this my solution for my current set-up? Solving the phase/combing issue?
Does the pot retain some function, i.e. send level, if you don't disconnect the wires altogether?
Could this resolve the hum issue as well?
Thanks!
Eric.
I'm using a Line6 M13 into my F-50, using the 4 cable method. Basically with Filters, and Distortion models straight into the amp, and Mod/Delay effects in the loop. But, there are 2 things that are happening. With the FX mix knob @ 50%, it sounds like I'm getting some comb filtering. It seems to go away when I'm at minimum, obviously, and at max. But there's also a hum that's coming through. When I run straight from the M13 into the F-50, no loop, no hum. I read through some forums, and it seems that the comb filtering has to do with the A/D/A creating a phase issue, and a loss of volume and tone.
I found a post from a while ago (2005) about modding the F-50 FX loop from parallel to serial. The poster is referring to Mesa Support:
I called their customer support and they quickly sent me a diagram on the change to the mix pot wiring, to make the loop serial.
Basically there are three wires that go to the three lugs on the mix pot. For the mod, you
-disconnect the 1st wire on the left (looking down onto the pot with the knob pointing down and the lugs up) and connect it to the middle lug (along with the middle wire that is already connected there)
-disconnect the 3rd wire which is on the right
There were some other mods for nomads that were basically the same, but instead of soldering back to the pots, they just disconnected the wires entirely from the pots, jumped wires 1 and 2, and insulated them?
My questions are:
Has anyone done this? Results?
Is this my solution for my current set-up? Solving the phase/combing issue?
Does the pot retain some function, i.e. send level, if you don't disconnect the wires altogether?
Could this resolve the hum issue as well?
Thanks!
Eric.
