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#1
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
Hi all.
I've decided to replace the 20 year old filter caps in my Kinergetics SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Any recs on a current, fast replacement cap would be appreciated. Also, would there be any advantages to going with a higher capacitance rating or should I stick with 10K? Thanks. |
#2
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
On Fri, 26 Feb 2010 17:48:02 -0800, Frank wrote
(in article ): Hi all. I've decided to replace the 20 year old filter caps in my Kinergetics SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Any recs on a current, fast replacement cap would be appreciated. Also, would there be any advantages to going with a higher capacitance rating or should I stick with 10K? Thanks. Generally, the component values chosen in a crossover determine that crossover's characteristics. Installing larger caps will likely (I don't know this for sure, not having seen the schematic), if they are crossover caps, change the frequency at which the crossover occurs. On the other hand, it is more likely that these caps are electrolytics used in the subwoofer amplifier's power supply as filters. Are you changing them because the amp is humming or misbehaving in some other way? Because if the subs are working normally, there is no reason to change them. If it ain't broke, don't fix it. |
#3
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
"Frank" wrote in message
Hi all. I've decided to replace the 20 year old filter caps in my Kinergetics SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Why? Have you diagnosed a problem with this unit? Any recs on a current, fast replacement cap would be appreciated. http://www.mouser.com/Search/Refine....626200+1323043 Also, would there be any advantages to going with a higher capacitance rating or should I stick with 10K? Thanks. What are your priorities? |
#4
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
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#5
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
On Mon, 1 Mar 2010 18:49:04 -0800, Frank wrote
(in article ): In article , says... On Fri, 26 Feb 2010 17:48:02 -0800, Frank wrote (in article ): Hi all. I've decided to replace the 20 year old filter caps in my Kinergetics SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Any recs on a current, fast replacement cap would be appreciated. Also, would there be any advantages to going with a higher capacitance rating or should I stick with 10K? Thanks. Generally, the component values chosen in a crossover determine that crossover's characteristics. Installing larger caps will likely (I don't know this for sure, not having seen the schematic), if they are crossover caps, change the frequency at which the crossover occurs. On the other hand, it is more likely that these caps are electrolytics used in the subwoofer amplifier's power supply as filters. Are you changing them because the amp is humming or misbehaving in some other way? Because if the subs are working normally, there is no reason to change them. If it ain't broke, don't fix it. The bass is not as tight as it used to be but still sounds very good and a hum has developed, but you need to be very close to the drivers to hear it. The hum was never there before and considering the 20 year old age, I just think it's time to refresh the caps. I find it hard to believe that 20 year old electro caps are still performing up to spec. Thanks. Well, it's possible. But my experience is that old electrolytics dry out with disuse, not while being used all the time. OTOH, if the hum is caused by leaky caps, replacing them CAN solve the problem (assuming it's not something else). Yes, you can use larger value ones than are called for without much problem. Theoretically, you are supposed to put multiple, parallel filter caps with a resistor between them to form a classic "pi" filter with the filter frequency as some multiple of 50-60 Hz (depending on whether a half-wave of full-wave rectifier is used in the circuit ,IIRC), but I have found it to not be that critical. |
#6
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
"Frank" wrote in message
The bass is not as tight as it used to be but still sounds very good and a hum has developed, but you need to be very close to the drivers to hear it. The hum was never there before... Ah, a distinct symptom! On the outside chance that the new hum is due to an enviromental situation (e.g., change to grounding such as indirect connection to cable antenna system), check to see how much hum the subwoofer amp has with no input attached. and considering the 20 year old age, I just think it's time to refresh the caps. 20 years is not necessarily the bell tolling for a well-made electrolytic cap. I find it hard to believe that 20 year old electro caps are still performing up to spec. Maybe yes, maybe no. I've seen a ton of well-made equipment meet spec after 20-30 years. |
#7
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
On Mar 1, 9:49=A0pm, (Frank) wrote:
In article , says... On Fri, 26 Feb 2010 17:48:02 -0800, Frank wrote (in article ): Hi all. I've decided to replace the 20 year old filter caps in my Kinergetics SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Any recs on a current, fast replacement cap would be appreciated. Also, would there be any advantages to going with a higher capacitance rating or should I stick with 10K? Thanks. Generally, the component values chosen in a crossover determine that crossover's characteristics. Installing larger caps will likely (I don't know this for sure, not having seen the schematic), if they are crossover caps, change the frequency at which the crossover occurs. On the other hand, it is more likely that these caps are electrolytics used in the subwoofer amplifier's power supply as filters. Are you changing them because the amp is humming or misbehaving in some other way? Because if the subs are working normally, there is no reason to change them. If it ain't broke, don't fix it. The bass is not as tight as it used to be but still sounds very good and a hum has developed, but you need to be very close to the drivers to hear it. The hum was never there before and considering the 20 year old age, I just think it's time to refresh the caps. I find it hard to believe that 20 year old electro caps are still performing up to spec. Thanks. Why do you suspect that the caps in the crossover are causing the hum? Most hum is caused by inductive pickup, poor grounds, or a faulty power supply. |
#8
Posted to rec.audio.high-end
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Replacement Filter Cap Recommendation
On Mar 2, 8:28=A0pm, sparky wrote:
On Mar 1, 9:49=A0pm, (Frank) wrote: In article , = says... On Fri, 26 Feb 2010 17:48:02 -0800, Frank wrote (in article ): Hi all. I've decided to replace the 20 year old filter caps in my Kinergetic= s SW200 subwoofer amp/crossover. Currently, there are two (2) screw terminal Phillips 10,000uf 75V caps measuring 3.5" high with a radius of 2". Any recs on a current, fast replacement cap would be appreciated. Also, would there be any advantages to going with a higher capacitan= ce rating or should I stick with 10K? Thanks. Generally, the component values chosen in a crossover determine that crossover's characteristics. Installing larger caps will likely (I don= 't know this for sure, not having seen the schematic), if they are crossover c= aps, change the frequency at which the crossover occurs. On the other hand,= it is more likely that these caps are electrolytics used in the subwoofer amplifier's power supply as filters. Are you changing them because the= amp is humming or misbehaving in some other way? Because if the subs are work= ing normally, there is no reason to change them. If it ain't broke, don't = fix it. The bass is not as tight as it used to be but still sounds very good an= d a hum has developed, but you need to be very close to the drivers to hear it. The= hum was never there before and considering the 20 year old age, I just think it= 's time to refresh the caps. I find it hard to believe that 20 year old electro ca= ps are still performing up to spec. Thanks. Why do you suspect that the caps in the crossover are causing the hum? Most hum is caused by inductive pickup, poor grounds, or a faulty power supply. The amps caps can be checked. Charge discharge, and ESR. I would first check all screw down terminals and crimps, after disconnecting all inputs and checking for hum, and relocating. I have never replaced a large capacitor, except for blown ones. greg |
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