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Topic: Modify second output of a Goodrich L10k? |
Bryan Daste
From:
Portland, Oregon, USA
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Posted 20 Oct 2006 12:03 pm |
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I'm just wondering if anyone has done this:
I'd like to modify my Goodrich L10k so that the second output is PRE-pot; i.e., not affected by the volume control. That way I could connect said output to my tuner, then simply turn the volume pedal all the way down when I want to tune. Seems simple, but I'm sure there are hidden impedance gremlins or something. Anyone tried? |
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Mike Fried
From:
Nashville, TN, USA
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Posted 20 Oct 2006 12:51 pm
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| Bryan, how difficult that would be depends on on function of the volume pot in the L10K's circuit - whether it controls the signal level after the buffer amp (in the signal path) or the gain of the buffer amp itself (out of the path). I don't know the particulars of that pedal but perhaps someone else here does? [This message was edited by Mike Fried on 20 October 2006 at 01:56 PM.] |
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Bill Terry
From:
Bastrop, TX
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Posted 20 Oct 2006 1:32 pm
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| I'm pretty sure (but not positive) that the pot is in the feedback loop of the opamp circuit. |
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John Bechtel
From:
Nashville, Tennessee, R.I.P.
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Posted 20 Oct 2006 8:13 pm
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I don't know anything about your model volume-pedal, but; it seems quite logical to me that the way to connect your guitar directly to your tuner would be to capture the guitar~signal direct from the input jack of your pedal and run the wires parallel to the second output jack, after removing the wires that are currently soldered to that jack!
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“Big John”
a.k.a. {Keoni Nui}
Current Equipment
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Bryan Daste
From:
Portland, Oregon, USA
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Posted 20 Oct 2006 8:27 pm
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| That's what I figured, but I thought I'd ask in case there was some factor I was overlooking. Thanks! |
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Earnest Bovine
From:
Los Angeles CA USA
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Posted 20 Oct 2006 9:49 pm
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| Quote: |
| capture the guitar~signal direct from the input jack of your pedal and run the wires parallel to the second output jack, after removing the wires that are currently soldered to that jack |
That will load the pickup differently; in other words it will change the impedance that the pickup sees, and will defeat the purpose of using a buffer amp. Maybe you will like the sound anyway but probably not (I don't). You don't have to rewire the pedal to find out; just try a "Y" connector. |
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Lynn Oliver
From:
Redmond, Washington USA * R.I.P.
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Posted 20 Oct 2006 10:27 pm
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The change in loading may or may not be an issue. I'd temporarily hook up a Y cable and take a listen.
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Lynn Oliver
 
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Fred Bova
From:
Connecticut, USA
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Posted 21 Oct 2006 10:00 pm
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Hi, I use a passive A/B Box that I modified.
1 input and 2 outputs. This is fed directly from my guitar, it is the first thing in my signal path, before my Volume pedal or other effects.
A Mode = Guitar feeds normal signal path only, and switch also lifts and mutes signal to the Tuner. No loading of pickup, or random movment on Tuner.
B Mode = Guitar feeds Tuner only, and switch also lifts and mutes the signal feeding my normal signal chain. Tuner works fine, does not see Volume pedal, it can be Up or Down. The signal to Volume pedal is muted, no one hears me tuning.
I can , and often do, check my tuning in the middle of a song, if I am "laying out" for a few bars.
No Loading issues at all.
Tuner does not care if the Volume pedal is Up or Down.
No batteries, unless you want to switch LEDs to tell you what Mode you are in.
I find I do not need LEDs to indicate what Mode I am in, as when I am in B Mode the Tuner LEDs sense the signal and start jumping around even if I just touch any of my strings.
I designed this years ago as the very early Digital Tuners ( and most likely some of the new Tuners also )would;
(A) Load the Pickup, changing the tone of the guitar.
(B) Add a buzzy / clipping distortion when they saw a loud signal.
(C) Induce a small sampling signal noise that would be audible when you solo'd the track after recording it, and the guitar player had left the building hours, or days ago.
Hope this helps.
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Mike Fried
From:
Nashville, TN, USA
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Posted 22 Oct 2006 5:14 pm
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Bryan and John, I'm afraid if it was that simple, everyone would be doing that - unfortunately it's not. Unless the two outputs are isolated from each other, they will interact in a negative way, both in impedance loading as Earnest says, and also possibly from sharing the shorting to ground when the pedal is backed off. That's why knowledge of the particular circuit is necessary to design the mod.
I'd go with an A-B box - I use a Radial Tonebone input switching box that has a tuner out (can also be used to switch amps) that works great with no power required and silent switching. |
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Jerry Hayes
From:
Virginia Beach, Va.
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Posted 24 Oct 2006 6:05 am
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Bryan, if you have a friend where you live who has an Ernie Ball volume pedal take a look at it. They have a tuner out on them where you can just cut your volume off with the pedal and the tuner signal is still on full bore. If you don't know anyone who has one I'll try to get mine out of the equipment van later today and pop the bottom off and tell you how they do it......JH in Va.
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Don't matter who's in Austin (or anywhere else) Ralph Mooney is still the king!!!
[This message was edited by Jerry Hayes on 24 October 2006 at 07:06 AM.] |
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