| Author |
Topic: Amp problem? Maybe? |
Jason Putnam
From:
Tennessee, USA
|
Posted 28 Jun 2016 6:46 am |
|
I was having an issue with a slight scratchy sound when changing volume with my volume pedal. It's was old Ernie ball volume pedal. So I got a new Goodrich volume pedal. Sound still was still there. I had replaced the pickup in my ShoBud so I figured it may be a wiring issue. I bought a Mullen G2. Sound is still there!!! I have changed cables, removed all effects, nothing fixes it! If I play at the same volume all the time it's clear. It only happens when changing the volume. I am about ready to give up!! I don't have another Nashville 112 to test it through.
_________________
1967 Emmons Bolt On, 1995 Mullen PRP 3x5,Nashville 112, JOYO Digital Delay, Goodrich Volume Pedal, Livesteel Strings |
|
|
 |
Mike Brown
From:
Meridian, Mississippi USA
|
Posted 28 Jun 2016 6:59 am Problem
|
|
| A second amp would be what I suggest, but.............. |
|
|
|
Mike Brown
From:
Meridian, Mississippi USA
|
Posted 28 Jun 2016 7:24 am Nashville 112
|
|
.........try plugging directly into the PRE EQ RETURN jack as this might be hung up or need cleaning. Also, try plugging into the POST EQ RETURN jack for the same reason. Do you hear this "scratchy sound" through the headphone output on the rear?
One last thing, plug into the POWER AMP INPUT on the rear panel direct with your guitar, do you hear this noise when doing any of the above?
If you find out what the problem is, I sure would like to know and if it is an amp problem, let me know and we will go from there. |
|
|
|
Ken Pippus
From:
Langford, BC, Canada
|
Posted 28 Jun 2016 7:36 am
|
|
| Isn't this just two volume pedals with scratchy pots? |
|
|
|
Mike Brown
From:
Meridian, Mississippi USA
|
Posted 28 Jun 2016 7:41 am Scratchy pots
|
|
| yes, it could be. |
|
|
|
Jeff Bollettino
From:
Virginia, USA
|
Posted 28 Jun 2016 7:49 am
|
|
Jason, since you've ruled out all the obvious possibilities (assuming you've tried mike's suggestions on the amp) I was trying to think of any oddball situations that might cause this. Here are 3:
Have the volume pedals all been clamped to the steel, and if so, is the scratching the same with it clamped and with it not touching the steel?
Also you mention disconnecting the effects. Did that include the tuner?
Other than those two, I would guess that there is a DC voltage on the input circuit of the amp, possible from a capacitor going bad. When you vary the volume pedal it would cause some scratchy sound. Again, this is based on all the other items being ruled out. If you have a voltmeter you could test for this by plugging a cable into the amplifier input, and measuring for DC voltage across the tip and ring of the cable plug.
_________________
Pig Hog Cables |
|
|
|
Glenn Demichele
From:
(20mi N of) Chicago Illinois, USA
|
Posted 28 Jun 2016 8:02 am
|
|
I'm thinking you may have a leaky input capacitor in your amp. This cap is supposed to block any DC, and prevent voltage from inside the amp from appearing at the input jack of the amp. If the cap is bad, DC will appear at the input jack and DC current will flow through your volume pedal - through the wiper to ground. This makes lots of noise when you move the wiper.
1). Add any kind of effects unit between the pedal and the amp. The effects unit's input will have a (hopefully good) blocking cap, and the effect unit's output will be able to "eat" the DC current from your amp without making noise. The effects unit should even stop the noise when the effect is in the "bypass" position UNLESS the effect unit bypass is a "True Bypass", in which case your noise might come back.
2). If you have a DC voltmeter, plug a guitar cord into the amp's input jack, then measure the DC voltage between tip and ring. It is supposed to be zero.
_________________
Franklin D10 8&5, Excel D10 8&5. Both amazing guitars! Homemade buffer/overdrive with adjustable 700Hz "Fender" scoop., Moyo pedal, GT-001 effects, 2x TDA7294 80W class AB amps, or 2x BAM200 for stereo. TT12 and BW1501 each in its own closed back wedge. Also NV400 etc. etc... |
|
|
|
Glenn Demichele
From:
(20mi N of) Chicago Illinois, USA
|
Posted 28 Jun 2016 8:02 am
|
|
I'm thinking you may have a leaky input capacitor in your amp. This cap is supposed to block any DC, and prevent voltage from inside the amp from appearing at the input jack of the amp. If the cap is bad, DC will appear at the input jack and DC current will flow through your volume pedal - through the wiper to ground. This makes lots of noise when you move the wiper.
1). Add any kind of effects unit between the pedal and the amp. The effects unit's input will have a (hopefully good) blocking cap, and the effect unit's output will be able to "eat" the DC current from your amp without making noise. The effects unit should even stop the noise when the effect is in the "bypass" position UNLESS the effect unit bypass is a "True Bypass", in which case your noise might come back.
2). If you have a DC voltmeter, plug a guitar cord into the amp's input jack, then measure the DC voltage between tip and ring. It is supposed to be zero.
_________________
Franklin D10 8&5, Excel D10 8&5. Both amazing guitars! Homemade buffer/overdrive with adjustable 700Hz "Fender" scoop., Moyo pedal, GT-001 effects, 2x TDA7294 80W class AB amps, or 2x BAM200 for stereo. TT12 and BW1501 each in its own closed back wedge. Also NV400 etc. etc... |
|
|
|
Jason Putnam
From:
Tennessee, USA
|
Posted 28 Jun 2016 8:18 am
|
|
My Goodrich has a pedal bar bracket. My EB does not. Same result with both. It's not real loud but is noticeable. Same on both pedals. Also I can move the pedal without playing. No scratch. Only when there is sound coming from the steel and the pedal moves.
_________________
1967 Emmons Bolt On, 1995 Mullen PRP 3x5,Nashville 112, JOYO Digital Delay, Goodrich Volume Pedal, Livesteel Strings |
|
|
|
Keith Hilton
From:
248 Laurel Road Ozark, Missouri 65721
|
Posted 28 Jun 2016 8:39 am
|
|
| Never trust guitar cords. Especially by simply changing guitar cords. The conductivity of the metal touching metal can make noise. Poor grounding and poor shielding can make noise. When you have any kind of noise always suspect your guitar cords FIRST. |
|
|
|
Jason Putnam
From:
Tennessee, USA
|
Posted 28 Jun 2016 5:21 pm
|
|
So I am pretty sure it's the pot on my pedal. It makes the noise in all jacks on the amp. I guess I'm just unlucky. Just got the pedal about a year ago. Already tore up! Not going to be giving good reviews.
_________________
1967 Emmons Bolt On, 1995 Mullen PRP 3x5,Nashville 112, JOYO Digital Delay, Goodrich Volume Pedal, Livesteel Strings |
|
|
|
Craig Baker
From:
Eatonton, Georgia, USA - R.I.P.
|
Posted 28 Jun 2016 6:25 pm
|
|
Jason,
For the Goodrich pedal, get in touch with Jim Palenscar at Steel Guitars of North Country at 760-754-2120.
Jim is known for great service and he has a ton of delighted customers. . . really hard to top Jim.
Respectfully,
Craig Baker 706-485-8792
cmbakerelectronics@gmail.com
C.M. Baker Electronics
P.O. Box 3965
Eatonton, GA 31024
_________________
"Make America Great Again". . . The Only Country With Dream After Its Name. |
|
|
|
Ken Pippus
From:
Langford, BC, Canada
|
Posted 28 Jun 2016 7:35 pm
|
|
| Wish I'd thought of that. |
|
|
|
