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#1
Posted to rec.audio.tech
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Amp picking up radio
I just bought a new little Laney amp for home, it buzzes less than my
last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? |
#2
Posted to rec.audio.tech
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Amp picking up radio
Have you checked the power lead for earth continuity? Have you checked your mains sockets for earth? I don't know what either of these means. |
#3
Posted to rec.audio.tech
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Amp picking up radio
On 10/31/2010 1:55 PM, Greg Forschler wrote:
Have you checked the power lead for earth continuity? Have you checked your mains sockets for earth? I don't know what either of these means. 1. Does your power outlet have three holes and your power cord three wires and prongs? 2. Make sure the round prong on the cord is connected to the ground on the unit. This requires a simple continuity tester or an ohm meter connected between the round prong and the chassis of the unit. The unit needs to be unplugged when you conduct this test. 3. Is the round hole on the power outlet connected to earth ground? This can be tested in a similar fashion, but will require you know where to find a good earth ground. 4. If both of these tests are good, then your unit is well grounded and this is not the problem. 5. If you are using a two wire cord or a two hole outlet, you likely have a ground loop and this is causing your problem. You MUST have good grounding. |
#4
Posted to rec.audio.tech
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Amp picking up radio
In article , Greg Forschler wrote:
I just bought a new little Laney amp for home, it buzzes less than my last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? Whats a Laney amp ?? Usually any connect can make a difference, at the speaker, the power cord, or inputs, or any other connection. RF filters, RF chokes, grounding, etc to fix. greg |
#5
Posted to rec.audio.tech
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Amp picking up radio
On Nov 2, 12:20*pm, (GS) wrote:
In article , Greg Forschler wrote: I just bought a new little Laney amp for home, it buzzes less than my last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? Whats a Laney amp ?? Usually any connect can make a difference, at the speaker, the power cord, or inputs, or any other connection. RF filters, RF chokes, grounding, etc to fix. greg Laney is the brand, popular in the UK I guess. I'm not sure what an RF filter or choke is. I'm not an electrician. The power cable does have the third prong for ground. I tried something called a ferite noise surpressor, with no change. I had a smaller lower quality amp before, still have it actually, it didn't pick up the radio so much but buzzed really bad. I almost think the new amp is just doing a better job acting as a true radio, where as the first one just picked up all the signals and didn't filter the frequencies out so it was just static. I'm not sure which is worse. |
#6
Posted to rec.audio.tech
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Amp picking up radio
In article , Greg Forschler wrote:
On Nov 2, 12:20=A0pm, (GS) wrote: In article = ..com, Greg Forschler wrote: I just bought a new little Laney amp for home, it buzzes less than my last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? Whats a Laney amp ?? Usually any connect can make a difference, at the speaker, the power cord= , or inputs, or any other connection. RF filters, RF chokes, grounding, etc to= fix. greg Laney is the brand, popular in the UK I guess. I'm not sure what an RF filter or choke is. I'm not an electrician. The power cable does have the third prong for ground. I tried something called a ferite noise surpressor, with no change. I had a smaller lower quality amp before, still have it actually, it didn't pick up the radio so much but buzzed really bad. I almost think the new amp is just doing a better job acting as a true radio, where as the first one just picked up all the signals and didn't filter the frequencies out so it was just static. I'm not sure which is worse. Not very normal to pick up radio STATIONS, usually its maybe one AM station. Something may be wrong with the amp. A filter box on the power cord side might help. Not sure where you tried a ferrite noise surpressor. Filtering the speaker leads is sometimes required on long speaker cables, but that should not be your problem. greg |
#7
Posted to rec.audio.tech
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Amp picking up radio
On Nov 18, 6:11*am, (GS) wrote:
In article , Greg Forschler wrote: On Nov 2, 12:20=A0pm, (GS) wrote: In article = ..com, Greg Forschler wrote: I just bought a new little Laney amp for home, it buzzes less than my last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? Whats a Laney amp ?? Usually any connect can make a difference, at the speaker, the power cord= , or inputs, or any other connection. RF filters, RF chokes, grounding, etc to= fix. greg Laney is the brand, popular in the UK I guess. I'm not sure what an RF filter or choke is. I'm not an electrician. The power cable does have the third prong for ground. I tried something called a ferite noise surpressor, with no change. I had a smaller lower quality amp before, still have it actually, it didn't pick up the radio so much but buzzed really bad. I almost think the new amp is just doing a better job acting as a true radio, where as the first one just picked up all the signals and didn't filter the frequencies out so it was just static. I'm not sure which is worse. Not very normal to pick up radio STATIONS, usually its maybe one AM station. Something may be wrong with the amp. A filter box on the power cord side might help. Not sure where you tried a ferrite noise surpressor. Filtering the speaker leads is sometimes required on long speaker cables, but that should not be your problem. greg- Hide quoted text - - Show quoted text - By filter box, do you mean like the noise surpressor outlets that sit between the power cable and the regular outlet? |
#8
Posted to rec.audio.tech
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Amp picking up radio
In article , Greg Forschler wrote:
On Nov 18, 6:11=A0am, (GS) wrote: In article .= com, Greg Forschler wrote: On Nov 2, 12:20=3DA0pm, (GS) wrote: In article = ups=3D ..com, Greg Forschler wrote: I just bought a new little Laney amp for home, it buzzes less than my last small amp, but seems to pick up radio signals much more, even when there is no cable plugged in (and when there is a cable I use Mogami cables that really do help alot). I've switched outlets, moved it around, nothing really helps. There is no ground switch either. I do notice that when I touch the amp, and especially hold the power cord, it eliminates most of it. So I'm wondering, is there something = I can get, besides a human body, to touch or 'hold' the cord, something to wrap around it or something that will do the same thing as when a human hand touches it? Whats a Laney amp ?? Usually any connect can make a difference, at the speaker, the power c= ord=3D , or inputs, or any other connection. RF filters, RF chokes, grounding, etc= to=3D fix. greg Laney is the brand, popular in the UK I guess. I'm not sure what an RF filter or choke is. I'm not an electrician. The power cable does have the third prong for ground. I tried something called a ferite noise surpressor, with no change. I had a smaller lower quality amp before, still have it actually, it didn't pick up the radio so much but buzzed really bad. I almost think the new amp is just doing a better job acting as a true radio, where as the first one just picked up all the signals and didn't filter the frequencies out so it was just static. I'm not sure which is worse. Not very normal to pick up radio STATIONS, usually its maybe one AM stati= on. Something may be wrong with the amp. A filter box on the power cord side might help. Not sure where you tried a ferrite noise surpressor. Filtering the speaker leads is sometimes required on long speaker cables, but that should not be your problem. greg- Hide quoted text - - Show quoted text - By filter box, do you mean like the noise surpressor outlets that sit between the power cable and the regular outlet? Right. It should an LC filter. greg |
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