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#1
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HELP! Weird cycling bursts of hiss
I have a four-year-old NAD reciever connected to some very old BIC
Venturi speakers. I haven't used it much recently, and when playing the radio today, I noticed short bursts of hiss (something close to white noise) interrupting the program ever so often--at least once per minute. I chalked this up to reception problems, but it turns out the same problem is present when playing cd's. Any suggestions about possible causes of/remedies for this obnoxious problem? Other than this, there is no indication that any of the equipment is failing. For what its worth, there is a history of strange electricity-related failures (power supplies suddenly going out, outlets failing, light bulbs burning out prematurely) here in my 1920s-era apartment. Your help will be much appreciated. |
#2
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In bt-9F66AE.16595526112004@localhost, on 11/27/04
at 12:59 AM, bt said: I have a four-year-old NAD reciever connected to some very old BIC Venturi speakers. I haven't used it much recently, and when playing the radio today, I noticed short bursts of hiss (something close to white noise) interrupting the program ever so often--at least once per minute. I chalked this up to reception problems, but it turns out the same problem is present when playing cd's. Any suggestions about possible causes of/remedies for this obnoxious problem? Other than this, there is no indication that any of the equipment is failing. For what its worth, there is a history of strange electricity-related failures (power supplies suddenly going out, outlets failing, light bulbs burning out prematurely) here in my 1920s-era apartment. Your help will be much appreciated. Tune an AM portable radio to the quietest spot you can find at the high end of the AM band. If the bursts of noise in your stereo correlate with noise on the AM band, you probably have a power or appliance problem. If this is true, move the radio to a new location and continue to monitor. As you move closer to the problem, the noise bursts will become louder on the radio. Hopefully, you can locate the source. Check the audio system for physical problems by smacking it with an open hand. If the system is healthy, you should be able to strike the unit quite hard with no audible response. (by "hard" I mean, use enough force that your hand may be uncomfortable, but don't bend any parts of the cabinet, break the knobs, or display.) ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
#3
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Thanks for the advice. I may have solved the problem--at least it has
played for a few minutes without trouble--by unplugging everything (including a non-functional tv that was still plugged in to the same power strip), cleaning the dusty power strip, replugging things (minus the TV), turning the power strip off and then back on. Just for curiosity's sake, I plugged the TV back in to see if I could clearly identify it as the source of the problem, but it didn't cause any immediate change. So I have tentatively remidied the symptom, but I don't know what the problem was, except that i seems to have been electrical. I tried your am radio test--no problem there--and the intermittant bursts of hiss occured even when there was no source (e.g., when the amp was set to "cd" and the cd player was powered off. |
#4
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In bt-78338A.14272427112004@localhost, on 11/27/04
at 10:27 PM, bt said: Thanks for the advice. I may have solved the problem--at least it has played for a few minutes without trouble--by unplugging everything (including a non-functional tv that was still plugged in to the same power strip), cleaning the dusty power strip, replugging things (minus the TV), turning the power strip off and then back on. Just for curiosity's sake, I plugged the TV back in to see if I could clearly identify it as the source of the problem, but it didn't cause any immediate change. So I have tentatively remidied the symptom, but I don't know what the problem was, except that i seems to have been electrical. I tried your am radio test--no problem there--and the intermittant bursts of hiss occured even when there was no source (e.g., when the amp was set to "cd" and the cd player was powered off. Your problem could be associated with the power strip. There could be a bad connection inside the power strip. (some of them are very poorly made) Or, there could have been a bad connection to one of the devices plugged into the strip. If the problem returns, try to find out if the noise follows the volume control. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
#6
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In bt-DF205F.07201428112004@localhost, on 11/28/04
at 03:20 PM, bt said: In article , (Barry Mann) wrote: If the problem returns, try to find out if the noise follows the volume control. If you mean could I adjust the volume of the noise bursts via the volume control, yes I could. I also noticed that the noise bursts were less loud when switched to "phono" as opposed to "cd" or the tuner. You can think of your system as being composed of three sections: Source (which could be the internal tuner or an external device), control (selector, tone, volume), and power amplifier. The Volume control is usually between the control and amplifier sections. (sometimes, usually in lower quality units, the tone controls are between the Volume control and the amplifier) Since your noise volume can be adjusted with the Volume control, the noise is probably not associated with the power amplifier. All seems fine now, but I am curious to understand what happend--thanks again for your reply. In any problem of this sort one must have a noise source and a susceptible piece of equipment. Eliminating the noise, preventing the noise from reaching the sensitive spot inside a unit, or improving the unit to reduce its sensitivity, will help. At some point, if the noise is intense enough, all equipment will respond. That's why military grade equipment is so expensive. It is very robust, cheap, low class consumer gear is not. (I'm not trying to cast your NAD in a bad light -- it is not cheap, but it is also not military grade.) Probably, your situation was power line related (the strip). A bad connection can create an intense noise source that is close to your equipment. A similarly intense noise generated in your neighbor's home may not have caused any trouble for you. Things can be very strange. I can recall a situation where a German language shortwave broadcast leaked into a stereo receiver operating in the northeast US. The shortwave reception was not associated with the stereo's tuner. Since there was an amateur radio operator across the street, I assumed there was an odd interaction between his equipment and my customer's stereo receiver. I modified the receiver to reduce it's sensitivity to the shortwave energy and solved the problem. Months later I encountered the same situation (same model of receiver) in an area about 20 miles from the first. Evidently, that model of receiver had an extraordinary sensitivity to a particular shortwave frequency. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
#7
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Thanks once more.
As I said in my first post, I've experienced symptoms in my current apartment that seem related to unreliable electricity, including a couple of well-functioning appliances (that TV I mentioned is one) that suddenly turned up "dead" (it seems the power supply failed while the unit was turned off but plugged in). Is there anything I can do (probably at the level of the power strip) to minimize the effects of what seems to be an unstable electrical system? |
#8
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In bt-766B95.10245828112004@localhost, on 11/28/04
at 06:24 PM, bt said: Thanks once more. As I said in my first post, I've experienced symptoms in my current apartment that seem related to unreliable electricity, including a couple of well-functioning appliances (that TV I mentioned is one) that suddenly turned up "dead" (it seems the power supply failed while the unit was turned off but plugged in). Is there anything I can do (probably at the level of the power strip) to minimize the effects of what seems to be an unstable electrical system? Start using a "Power Conditioner" on everything. Simple surge suppressors are not good enough for really bad situations. Unfortunately, if the ground provided by the electrical system is poor, none of the above will be really effective. Keep everything unplugged unless you are using it. Unstable electrical systems are fire hazards. Have regular fire drills, make sure your life insurance is paid, and break the lease. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
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