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Topic: Goodrich volume pedal trouble. |
James Wishart
From:
Rhode Island
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Posted 10 Mar 2021 4:06 pm |
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Hey all. I could use some help. The pot on my 4 year old slightly used Goodrich pedal failed. I purchased a Dunlop replacement. I may have wired it incorrectly. The pedal is not functioning correctly with the new pot. The volume swells are uneven when depressing the pedal, and uneven when trying to lower the volume.
I can find no clear advice on how to properly wire it. Does anyone know how to do it? When holding the pot with the 3 connections facing up, and the shaft facing you, which wires connect to the instrument input and the amp outputs?
Explanations on YouTube are unclear. I do not need information on ohms, resistance, etc. I just want to know which wire goes where.
I apologize for the lengthy post. Thank you for any input. |
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Tucker Jackson
From:
Portland, Oregon, USA
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Posted 10 Mar 2021 5:37 pm
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Hi, James.
Here is a diagram Bill Ferguson sent when I got a Dunlop replacement pot for my Goodrich.
The only tricky thing is the orientation of the three terminals on the pot. If you turn it a certain way, it looks like a face, with two eyes and a mouth a bit below. In this diagram, the 'face' is lying on its side, with the eyes at the far left.
And here is an old thread with a nice photo of the wiring:
https://bb.steelguitarforum.com/viewtopic.php?t=317793&sid=d38feeea260e99eca256eb87808f6626
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Larry Dering
From:
Missouri, USA
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Posted 10 Mar 2021 5:54 pm
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| And Goodrich has a video on YouTube showing how to put the string on right. Also forum member Greg Cutshaw has a web site with all you could want to know about this. |
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Jerry Overstreet
From:
Louisville Ky
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Posted 10 Mar 2021 6:02 pm
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| FWIW, the new edition Dunlop 470K Hotz Potz has tabs on the side instead of those little pins on the back. I did not find a diagram for that one. |
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Lee Baucum
From:
McAllen, Texas (Extreme South) The Final Frontier
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Posted 10 Mar 2021 6:38 pm
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| Make sure the string is wrapped properly and snugly. |
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James Wishart
From:
Rhode Island
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Posted 11 Mar 2021 6:52 am
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Hey all,
Thank you for the responses. I do know how to properly wrap the string. I have seen that video.
Jerry, you are correct when you say there is no diagram for the Dunlop. That is exactly what I need.
Tucker, I will try to adapt your diagram to the Dunlop brand. Thank you for it.
Larry, I will check the Greg Cutshaw website.
I’m optimistic.
Thanks again. |
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Jerry Overstreet
From:
Louisville Ky
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Posted 11 Mar 2021 7:19 am
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The new Dunlops with the side tabs probably wire like the old style AB, Clarostats etc., but I don't know that. I have some links to that wiring if they are the same but didn't post them to avoid confusion for now.
Sorry, but I am not knowledgeable enough to tell you which tab goes where. I know there is a procedure with an ohmmeter, but I don't think you want to get into all that. |
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James Wishart
From:
Rhode Island
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Posted 11 Mar 2021 12:43 pm
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| You are correct. I do not. ha ha. |
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Tucker Jackson
From:
Portland, Oregon, USA
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Posted 11 Mar 2021 2:09 pm
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If there are three lugs, the middle one is the wiper, so it is the output from the pot. So, wire the orange (or red) wire from the middle lug to the two 'Amp' jacks on the pedal.
The remaining two lugs are for hot and ground, and I don't think it matters which one you use for each. Can some of you electronics guys kick in here and verify if that's true? I've seen volume pots wired both ways on the net (hot to lug #1, ground to lug #3... and then the reverse of that).
The hot should be white (or green) and is connected to the 'Instrument' jack on the pedal.
Ground should be brown (or black) wire and is also connected to the 'Instrument' jack, but on the ground terminal. |
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Jerry Jones
From:
Franklin, Tenn.
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Posted 11 Mar 2021 3:42 pm
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Looking at the back of the pot with tabs pointed toward you:
Left tab = input
Center tab = output
Right tab = ground
Because we use log pots, it does mater which tab is used for ground. Reversing the other tabs allows an instrument like a two pickup jazz bass to adjust the volume of one pickup without affecting the other. In most all other cases, center tab is output.
_________________
Jerry Jones |
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George Biner
From:
Los Angeles, CA
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Posted 11 Mar 2021 3:52 pm
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OK, Tucker is right, the pedal output goes to the wiper lug.
The other two lugs are not interchangeable. Basically, when the pedal is all the way down, the output should be all the way up, and the wiper will have rotated all the way toward one side of the pot. Connect the input wire to that side/lug.
If the lug is labeled "CW", the wiper will be at that lug when turned fully clockwise; If "CCW", the wiper will be at that lug when turned fully counterclockwise; look at the string path and exercise the pedal to see which one to connect the input to.
The unused lug gets the ground.
Hope this is clear tho I realize it may not be !!
I always take a picture of anything I disassemble before I start.
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Jerry Overstreet
From:
Louisville Ky
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Tucker Jackson
From:
Portland, Oregon, USA
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Posted 11 Mar 2021 4:45 pm
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OK, gents, thanks for clarifying that lugs 1 and 3 are not interchangeable on the kind of pots we use (log aka audio taper). That makes sense -- there is a taper involved, and running the signal backwards through the pot would give an opposite taper.
Why would a manufacturer not supply a diagram? I've seen some new Dunlop pots on their website and the lugs are labled 1, 2, and 3 (stamped in the metal on the back of the pot). OK, great.
But I've seen conflicting info on the net for how to wire a simple volume control: many diagrams have 'input' wiring connected to lug 1 (like at the Fralin site).
And then several others sites show 'input' going to lug 3 (like at the Stew Mac site). The only thing everybody agrees on is that Lug 2, in the middle, is the output. I don't get it... the rule for sellers should be 'if there's any doubt, overcommunicate.' |
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George Biner
From:
Los Angeles, CA
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Posted 12 Mar 2021 10:21 am
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You can get out a volt-ohm meter, take the pot and measure the resistance between the wiper to one side while turning the wiper -- when the meter reads zero, the wiper is at that side.
Also, to tell if you have an audio taper, dial it to the middle of the range -- if the resistance is 1/3 of the rated resistance, you have a taper (log/audio) pot.
Pots aren't usually marked but you can usually find a datasheet which shows the pin-out. And the terminal layout almost always matches the geometry of the ring-shaped resistance element and wiper - they're not gonna cross the wires inside. I guess in the old days it was visually apparent from the physical layout of the open potentiometers so they never formed the habit.
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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James Wishart
From:
Rhode Island
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Posted 12 Mar 2021 5:13 pm Pedal
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Hello all.
I want to provide an update. IT WORKS! A link by Jerry to a post he provided in 2017 gave the answer I needed. My original wiring setup was incorrect. I made the corrections, and all is well. Thank you all so much for your input.
I have known all along that this is a wonderful forum, and I am proud to be a member of the steel community. |
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Jerry Overstreet
From:
Louisville Ky
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Posted 12 Mar 2021 5:19 pm
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| Happy to help. I'm glad you found the information useful and I appreciate you saying so. |
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Chris Brooks
From:
Providence, Rhode Island
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Posted 15 Mar 2021 7:21 am
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>and I am proud to be a member of the steel community.
We are proud to have you with us, Jim! Stay in touch.
Chris |
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