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Topic: Myrick Emmons Volume Pedal Mod ? |
Bobby Boggs
From:
Upstate SC.
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Posted 16 Jun 2010 6:47 am |
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A nice fellow sold me a Emmons VP with a 2nd out-put and called it the Myrick mod. Now I know this is not right. The so called Myrick mod involved a switch that increased the power.Dad had one installed. I never cared for, or saw the need for it. I could always get more power than the amp could handle anyway. I just don't how or what the switch did the caused the power increase. I'd just like to know for my on education Thanks in advance......bb
Last edited by Bobby Boggs on 16 Jun 2010 8:04 am; edited 1 time in total |
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Jerry Roller
From:
Van Buren, Arkansas USA
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Posted 16 Jun 2010 7:07 am
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Bobby, I have some Emmons pedals with the Weldon Mod which is a second pot but no switch so I think you might have the real thing. Could it be that Weldon added a switch to switch the "mod" pot in and out? Mike Cass could explain how it works and of course Weldon could. Maybe one of them will come on and explain it. I bought either one or two of these pedals from Mike.
Jerry |
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Jack Stoner
From:
Kansas City, MO
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Posted 16 Jun 2010 7:36 am
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The "Myrick Mod" did not have a switch, just the addition of the additonal pot. I did many in the early 70's when I was the amp tech at Little Roy Wiggins Music City music store on lower broadway.
The first one I did was for Hank Corwin, who had copied what Weldon had done one his and brought it to me to copy.
The Myrick Mod is not just for Emmons pedals, any pot type volume pedal can be modified for this. |
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Bobby Boggs
From:
Upstate SC.
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Posted 16 Jun 2010 8:03 am
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| Yes. I remember now. But dad's does have a switch so you can use it either way. As stated I preferred the conventional way....Thanks Guys. |
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Buddy Castleberry
From:
HAWKINSVILLE GA USA - R.I.P.
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Posted 16 Jun 2010 8:14 am
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IF YOU PLUG AN EMMONS PEDAL UP BACKWARDS
IT WILL BE REAL BASSE.THE EXTRA POT IS A TONE POT
IT LETS YOU ADJUST THE TONE WHICH GIVES YOU A BIGGER FATTER SOUND BUT YET NOT BASSE
IF THAT MAKES SINCE |
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Clyde Mattocks
From:
Kinston, North Carolina, USA
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Posted 16 Jun 2010 2:10 pm
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Reversing the cables on an Emmons pedal will give you quite a different tone. Putting this pot in the circuit effectively allows you to chose any point between the extremes. I do it to all my pedals. I prefer mine backed off slightly from full treble. I would not dispute that this is a Weldon mod, but I do know that Leonard Stadler (Marlen) was doing it a very long time ago.
_________________
LeGrande II, Nash. 112, Fender Twin Tone Master, Session 400, Harlow Dobro, R.Q.Jones Dobro |
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Dick Sexton
From:
Greenville, Ohio
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Posted 16 Jun 2010 2:31 pm Pedal Mod...
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| Hey Clyde, any chance you'd describe how Mr. Stadler hooked that pot up? A 500K? Thanks buddy... |
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Clyde Mattocks
From:
Kinston, North Carolina, USA
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Posted 16 Jun 2010 4:30 pm
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Dick, looking at the bottom of the pot (the can), the wire from the left terminal goes to the + (blade) side of the front input jack. The wire from the center terminal goes to the + (blade) side of the rear input jack. The right terminal is vacant.
_________________
LeGrande II, Nash. 112, Fender Twin Tone Master, Session 400, Harlow Dobro, R.Q.Jones Dobro |
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Dick Sexton
From:
Greenville, Ohio
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Posted 16 Jun 2010 5:13 pm Hook up!
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| Thanks Clyde... |
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Ron Funk
From:
Ballwin, Missouri
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Posted 16 Jun 2010 8:42 pm
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This is pic of underside of an Emmons drop-pin VP that I recently purchased.
The knob & second pot did not affect tone, so I had it disconnected.
Is this similar to the pedals/pots that others are referring to?
I'm curious as to original intent.....
Thanks for any info others can share. |
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Jack Stoner
From:
Kansas City, MO
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Posted 17 Jun 2010 2:09 am
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Here is a schematic of the Myrick Mod
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Brad Sarno
From:
St. Louis, MO USA
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Posted 17 Jun 2010 6:31 am
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It's an interesting circuit. Not only does the "Myrick" pot affect the loading of the pickup, which does act as a form of "impedance loading tone control", but that amount will vary as the volume pedal travels thru its normal volume sweeps. But mainly what I see is a "taper" control. By having a variable resistor placed between the input and the wiper of the volume pot, you effectively alter the taper or onset of the volume pedal. Pretty cool and handy. I once had a Goodrich pedal that came with this knob. I forget the model #, but it had the added black knob on the side.
Pretty cool and useful. I recall someone saying that they or maybe Weldon liked this taper control to adjust for loud and quiet stage settings. Sometimes he needed the faster onset when it was loud. You can see by the circuit that when the volume pedal is maxed, this added pot does nothing, but as the volume pot is attenuating, this added pot will change the resistance value between the pickup and the wiper, essentially allowing for your volume pedal to have an earlier or faster onset as you turn the volume up from silence.
A natural artifact of this taper control is that if you set it for fast onset, then your lower volume settings will sound a bit duller or darker because of the way it loads the pickup down like a variable impedance control. My take on this mod was always that it was first and foremost a taper mod for faster, earlier onset.
B |
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Ron Funk
From:
Ballwin, Missouri
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Posted 17 Jun 2010 7:53 am
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Brad & Jack -
Thanks for your knowledge !
On that old Emmons Drop-Pin Volume Pedal, I had the wiring of that 2nd pot disconnected - but retained the pot - and exterior knob - on the pedal.
I refer to it as my 'talent' knob -
turning the knob doesn't add any !!
Ron |
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Dick Sexton
From:
Greenville, Ohio
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Posted 17 Jun 2010 10:05 am ???
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| Values??? Assuming 500K for the volume pot... |
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Clyde Mattocks
From:
Kinston, North Carolina, USA
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Posted 17 Jun 2010 11:09 am
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All I have ever seen were 500K. Another thing I use it for is, the more you back off from full, the lower your single coil hum in the studio. Of course this lessens the output. I suppose its the same as turning down the amp, but lots of times I am in one room and the amp is in another, so I use it in this way.
_________________
LeGrande II, Nash. 112, Fender Twin Tone Master, Session 400, Harlow Dobro, R.Q.Jones Dobro |
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Dick Sexton
From:
Greenville, Ohio
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Posted 17 Jun 2010 11:26 am Many thanks!
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Jack and Clyde
I've got to try it and just happen to have 500K pot. Think I'll just alligator clip it in, till I see if its something I'll be able to get some use of.
Again, thanks... |
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Jack Stoner
From:
Kansas City, MO
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Posted 17 Jun 2010 11:44 am
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| Look at the notes at the bottom of the schmatic, both pots are standard 500K volume pedal pots. |
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Dick Sexton
From:
Greenville, Ohio
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Posted 17 Jun 2010 11:50 am Bottom of the diagram..
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I'm asleep again...  |
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John Bechtel
From:
Nashville, Tennessee, R.I.P.
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Posted 28 Jun 2010 5:42 pm
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I've installed this ‘taper-pot’ on quite a few VP's that I've owned over the years and the 500K or 250K is not really important for it's function. Just about any value Audio-Taper pot will suffice for it's purpose.
_________________
<marquee> Go~Daddy~Go, (No), Go, It's your Break Time</marquee> L8R, jb
My T-10 Remington Steelmaster |
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John Groover McDuffie
From:
LA California, USA
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Posted 2 Jan 2011 12:28 pm
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| I think the Goodrich version has a resistor in series with the taper control to set a minimum resistance to the range of adjustment. |
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John Bechtel
From:
Nashville, Tennessee, R.I.P.
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Posted 2 Jan 2011 12:37 pm
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With the little I know about electronics, you wouldn't even need a pen to write it down¡¡¡
_________________
<marquee> Go~Daddy~Go, (No), Go, It's your Break Time</marquee> L8R, jb
My T-10 Remington Steelmaster |
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John Groover McDuffie
From:
LA California, USA
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Posted 2 Jan 2011 1:13 pm
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Yes, the Goodrich uses a 22k resistor in series with the taper pot:
CW = clockwise (not Country & Western) CCW = counter-clockwise (not Contemporary Country-Western) |
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