Question about Keeley TS808 True Bypass Modded Guitar Pedal

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There is a scratchy sound when the overdrive is engaged. Its not a hiss but a scratchy sound that is noticeable when you hit a cord or note and its fading out

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There likely is a component failure. Possibly an electrolytic capacitor. Also low voltage due to failing power adapter or depleted battery would cause this. Do NOT count on LED for battery health..

Posted on May 18, 2011

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The amplifier may be turned up too high!

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HI just got a A70 . I love the amp, except when I hit certain low notes I get a crackle just before the note rings out. Tried 3 new cables same thing , cleaned guitar jack and checked out connections...


You are probably overdriveing the unit... In a 20 foot square room, if *********** could not stand to stay in the room, it is too loud and likely driving the voice coil outside the linear range. This makes a very nasty noise.

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I feel that the 'normal' background hiss is a problem that I would like to minimize with the sennheiser IEM 300. I'm currently using the IE 4 ear phones. Would a different/better earset with maybe a...


No, that will not help. The his is a function of the receiver NOT receiving a signal from the transmitter as they apparently do NOT have a "squelch" circuit to mute the receiver noise when no signal is being received. The noise level when no signal is received is pretty high and apparently the volume control is not enough to reduce the hiss.

To solve this, LEAVE the transmitter ON and make yourself a switch at the receiver. DO this using one of those little in line lamp switches that fit on zip cord. Make one on a short length of zip cor with mating connectors to fit the received jack and the headphone plug. Don't worry about unshielded wire as the impedance is very low. Then you use this switch to mute the headphones when you want to. There are other switch types you can use, I am just suggesting what might be readily available to you.

Sennheiser SHOULD have include a mute switch on their unit as turning the power off on the receiver would be a pain. They could have used a volume control with switch to kill the audio line out... simple solution... oversight on their part.

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I have a Peavey 8600 amplifier. It sounds great but when only operating vocals, in order to get the highs of your voice just right, the speakers put off a large amount of white noise. While singing, you...


There is not enough info here to provide a complete answer, but let me give you some background:

There will always be some hiss. This is due to general amplification where a small amount of noise is amplified along with the general signal. In most cases, the signal is strong enough to overpower any noise that is present (vocals in your example). This noise should not be that noticable in normal cases. If there is an automatic gain control in the line, this could account for it as with "silent" times, the gain will automatically be increased potentially to the degree where the noise is noticable.

Barring that scenerio, if the input signal is too low, the overall gain necessary to produce reasonable volume at the speakers will also be such that the noise is noticable. In order to track this down, please provide details about the current setup including:

1) Microphone make and model being used
2) Input being used on the mixer
3) Gain level being used for the mic channel
4) Gain level being used at the master level.

Dan

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1 Answer

My swr workiongpro 15 suddenly has a very noticable hiss even when the amp is muted, and when I play the high end is more prominent than it was before.


If you are having the treble/high turned up there will be hiss. This is due to the statistical noise in electronics, including semiconductors. It is a matter of degree. The hiss should be 30 Db below your program level or so.

It is very common for one to change settings and suddenly start to notice hiss or hum at certain settings.

IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).

There is very little in your amp that would have changed to suddenly start generating hiss, so FIRST compare. This will minimize the chance of spending money at a shop to be told it is normal.

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Scratchy volume potentiometer


Try cleaning your volume potentiomenter with contact cleaner (they come in spray can's), the scratchy sound is audible when you turn your volume control on, the contacts inside your potentiometer accumulated dust or some other particles.

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Constant buzzing in my 15 W amplifier


Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.

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Korg pa800 mic input makes funny noise


First turn the unit off then rotate the input level volume control. If it feels loose pull up lightly on it as you do this. Also rotate all your controls that you don't normally use a lot. Chances are the pots are dirty. If that doesn't help you might want to check all the connectors inside the unit if you feel confident enough to go poking around. Other wise I suggest that you find a shop that will fix the problem. If you do go poking around make sure the units unplugged and that you have grounded yourself against static discharges. 

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