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Post by jedinite24 on Sept 30, 2011 22:06:07 GMT -5
Hi everyone
I'm in need of some assistance. I was just listening to some music in my 2 channel system and noticed that music from the left channel is really distorted. I initially thought there was something wrong with the speaker but when I switched the speaker wires around the distortion followed to the other speaker. The distortion is really bad. The music from that one channel is really garbled, scratchy and full of static. One thing that I noticed was that the left channel's heat sinks were cold while the right channels heatsinks were lukewarm. I had the amp (rebuilt SUMO Nine) on for awhile warming up before I would sit down and listen to music.
Any ideas as to what is wrong with the left channel or the amp? I don't think that it is a blown fuse. I'm hoping that it isn't going to be an expensive repair.
Thanks in advance.
JD
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NorthStar
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"And it stoned me to my soul" - Van Morrison
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Post by NorthStar on Sept 30, 2011 22:11:19 GMT -5
Check all your speaker cables and Interconnects.
* Just use some extra ones to see if it makes all the difference.
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Post by jedinite24 on Sept 30, 2011 22:42:24 GMT -5
Evening Bob
Thanks for the prompt response. I re-seated the original interconnects and then even tried a totally different set of ICs and the distortion, scratchiness etc was still present. I even tried a different preamp in place of my Emotiva USP-1 and still got all that distortion and noise from the left channel. I'm relieved that there are no issues with the USP-1.
JD
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NorthStar
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"And it stoned me to my soul" - Van Morrison
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Post by NorthStar on Sept 30, 2011 22:54:13 GMT -5
Good evening JD,
OK, and you did switch your speakers, so now the amp is the last one left. {Try another amp, a spare one you have around, or even a receiver; then you'll know for sure.}
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Post by essheil on Oct 1, 2011 3:40:44 GMT -5
you might want to use DEOXIT to clean and lubricate your terminals on the amp. If that doesn't work, internally there is probably an issue with some of the resistors. If it was a transistor, you would have no current going thru. I would suggest to have it serviced if none of the cleaning and wire testing works. Most likely there's a problem in the amplifier circuit! Technicians use this method called THEVENIZING when pinpointing a problem area! Basically instead of doing 5 steps for example, you look at the main component having the problem and breakdown the steps into specific area or basically shortening the steps to troubleshooting.
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Deleted
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Post by Deleted on Oct 1, 2011 6:01:19 GMT -5
Might help, might not. My Bel had noise in its left channel. There was a 1A fast blow fuse near the left channel board that was blown. Replaced it. No more noise. Maybe check all your fuses
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DYohn
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Post by DYohn on Oct 1, 2011 9:12:07 GMT -5
Sounds to me like an IC has gone bad. If you swap right and left input cables between the preamp and amp, does the distortion stay in the same speaker or change? If it stays the same the problem is an output device in your amp. If it changes with the cables then it's either preamp or source.
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Post by jedinite24 on Oct 1, 2011 9:18:56 GMT -5
Morning gents
I've spent the morning trying Bob's and essheil's tips. When I did an amp swap the music was clear in my system. No distortion/staticy scratchiness at all in either channel. While I was listening to music I cleaned the speaker terminals and IC inputs of the Sumo Nine with DeOxit. After the cleaning it was back into the system. The distortion in the left channel was still present.
Kraemer. I'm going to check the fuses tonight when I have more time. To get at the internals of the Sumo Nine I have to remove the face plate then the top cover. I feel like I'm unmasking Lord Vader when I look at it all.
Essheil: Thanks for all that info. I'm going to e-mail some of the techs I've worked with in the past to see what their availability is. Any idea what could have caused a resistor to get damaged?
Thanks again everyone for replying so quick to my inquiry.
JD
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Post by Mr. Ben on Oct 1, 2011 9:36:49 GMT -5
There are some amps that will act like this with a blown fuse. The Hafler 220 that you had was like that. I'm not sure about the Sumo nine, but any class-A amp with a cold side must have a problem unrelated to cables. When was the amp rebuilt? Maybe it's still under warranty?
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Post by jedinite24 on Oct 1, 2011 20:50:18 GMT -5
Evening folks Dyohn. Sorry for not getting to your reply before. When I was typing my reply @ the time I didn't see your post. Well I did try what you said before updating this thread and the distortion and static stayed on the same channel. Now fearing the worst that it was either a blown resistor or output device as you said I decided to remove Lord Vader's mask just to check the fuses based on what Kraemer and Mr.Ben had posted. Kraemer was right in tell me to check the fuses as they were the culprit. Mr.Ben was correct too as my amp is one of those that have distorted sound when one of the fuses on that channel are blown. Now I know. The Sumo Nine has 2 fuses on each channel. I was very relieved that one of the 2 fuses on the left channel was burned out. The wire in the fuse was burned through. The fuse wasn't totally greyish black on the inside. I believe the fuses in the Sumo Nine were fast blo fuses from what I was told previously but I will double check with the tech who did the re-build. Off to Radioshack tomorrow to get some new fuses. Thanks you guys for the help. One of the local techs I e-mailed I think practices Thievery instead of THEVENIZING. He wanted $75 up front to look @ my Sumo Nine. Boy am I relieved it is just a blown fuse. I wonder what could have caused the fuse to blow? I have the Sumo Nine plugged into the high current outlet of my Dad's Belkin PF60. If the fuse blows again I'll be querying you all again. Glad to hear from you again Mr.Ben. I know you don't post here frequently as much as before. I missed the Hafler DH220 that I bought from you previously so when a re-built one came up for sale at a very reasonable price I scooped it up. Thanks again everyone for the help. JD
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NorthStar
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"And it stoned me to my soul" - Van Morrison
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Post by NorthStar on Oct 1, 2011 21:24:29 GMT -5
Problem 'fused'! * Matt ( Kraemerkid) was the first one with the right solution.
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Post by jedinite24 on Oct 1, 2011 22:34:16 GMT -5
Problem 'fused'! * Matt ( Kraemerkid) was the first one with the right solution. Hey Bob Good stuff. This sure was a conFuseing situation that members helped me resolve. Speaking of help. I also made edits to my post to reflect Kraemer's timely advice. The kid has helped me on a lot of things. I'm looking at the TT weight he made for me as it spins on my table right now. Good stuff. JD
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NorthStar
Seeker Of Truth
"And it stoned me to my soul" - Van Morrison
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Post by NorthStar on Oct 1, 2011 22:50:55 GMT -5
Yes, Matt is a fantastic individual here at the Lounge, and we are very lucky to have him indeed.
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Post by brendelac on Feb 7, 2015 21:17:08 GMT -5
Old thread, but I have a Parasound 2205AT with a similar issue. Channel 5 works, but has moderate static that comes and goes. Fuses look fine. Terminals look perfect. Definitely an amp problem as I purchased it in this condition and am hoping it will be a fix that I can do myself. All other channels are functioning great.
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Post by vcautokid on Feb 8, 2015 0:00:39 GMT -5
In the I know it is obvious department, please employ a Multimeter to check continuity of the fuse to make sure it is good. Sometimes, the fuse will expire at the end, and you can't see it visually, but it will measure as an open.
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Post by Porscheguy on Feb 8, 2015 7:47:46 GMT -5
In the I know it is obvious department, please employ a Multimeter to check continuity of the fuse to make sure it is good. Sometimes, the fuse will expire at the end, and you can't see it visually, but it will measure as an open. This thread is like 4 years old.. I'm sure whatever was wrong it's fixed by now
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Post by vcautokid on Feb 8, 2015 7:58:35 GMT -5
Thread is but the technique holds true today.
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Post by brendelac on Feb 8, 2015 13:24:43 GMT -5
In the I know it is obvious department, please employ a Multimeter to check continuity of the fuse to make sure it is good. Sometimes, the fuse will expire at the end, and you can't see it visually, but it will measure as an open. I pulled a fuse from the problematic board and tested with the multimeter (there are actually two per board, 250V, 8A) and they are both fine. I'm not the best with electronic repair, but when the fuses are out, the channel still functions along with the static. Is that how it should be?
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Post by vcautokid on Feb 8, 2015 14:01:31 GMT -5
Hmmm, that definitely sounds fishy. Where were fuses located? On a board by itself, on a board where the big heat sinks are etc.? I know vague qeustion. Just trying it out better.
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Post by garbulky on Feb 8, 2015 14:09:02 GMT -5
Old thread, but I have a Parasound 2205AT with a similar issue. Channel 5 works, but has moderate static that comes and goes. Fuses look fine. Terminals look perfect. Definitely an amp problem as I purchased it in this condition and am hoping it will be a fix that I can do myself. All other channels are functioning great. You mentioned terminals "look" perfect. Have you switched both the interconnects? And after trying that switched speaker wire around?
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