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Old 11-01-2011, 06:15 AM   #29
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Originally Posted by Sparkygus
...We also have a very bad buzz in our factory installed sound system, but we get the converter hum/buzz even with the sound system turned off completely....
You and I have about the same year model so it is likely you have a Parallax 7355. On these models, the fan is normally the only source of noise. From your description of the symptoms it does appear that some component is "ringing" dependent on the load that you hear as a varying hum. It is possibly putting a ripple on the 12v output or emanating some RF. That might also be the source of the hum you hear in the audio system. Find the 110 circuit breaker (on mine it is the 3rd from left) that supplies the converter and switch it off. Does that solve the problem with your sound system?

You may have a subwoofer hidden out of sight. If it proves to be the source of the hum for your audio system, there is also a fix for that that is published on the Airstream website.
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Old 11-01-2011, 06:24 AM   #30
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Typical AS after the fact solution...

Let the customer DIY...

Bob
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Old 11-01-2011, 06:27 AM   #31
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Originally Posted by Sparkygus
... I'm looking through the web at the Intellipower converters. Does anyone know which model is a direct replacement for the factory installed unit?...
The Intellipower PD 4655 is a direct replacement for the Parallax 7355.

http://www.bestconverter.com/4600-se...its_c_133.html
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Old 11-01-2011, 08:59 AM   #32
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Regarding the hummm in our 2007, it's different than the converter fan coming on. The fan noise we can live with. What bugs us is a hum/buzz (sometimes quite loud) that we get with different electrical loads. Certain combinations of lights being used will cause a very annoying buzz. We can affect the buzz by simply changing the lighting combination, but it's quite annoying to not be able to light the trailer the way we want. Something as simple as turning on the bathroom light or the bedroom light can really affect the electrical noise.
Well, this is a new one on me. It does sound as though there may be something wrong with the converter. Would be interesting to look at the DC output with a scope. The converter might still be working after a fashion with one bad diode or transistor.

For what it's worth, that's what happened to our old-fashioned ferroresonant converter. The battery charging voltage was a little low and I found a bad diode in the output bridge. I don't know how long it had been like that. That provided an excuse to replace the old 50 pound boat anchor with a 5 pound Intellipower which, in addition to being quiet and saving weight, takes much better care of the battery.
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Old 11-01-2011, 09:03 AM   #33
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I read the ubiquitous Univolt humm is from breakdown of the varnish on the armature. Theoretically the armature can be repotted and the humm stopped. Or so I have been told.
Yes, that's how it's done.

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Old 11-02-2011, 09:19 AM   #34
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Thanks for the info about the AS subwoofer noise issue fix. I'm getting the trailer this weekend, and will get to work on sorting out the problems.
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Old 11-06-2011, 09:40 PM   #35
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Today I replaced the battery disconnect relay. It had recently failed, and I suspect that it been failing for quite some time. After installing the new relay, the very loud hum dissipated to a level that is barely discernible. For now, I'm going to hold off on buying and installing a new converter. Does a new converter manage the batteries better than the Paralax that is currently installed.

I also purchased a Radio Shack ground loop isolator and put that in the audio system and we now have much better audio.

I'm happy with how a couple of quick fixes significantly improved the usability of our rig!

Thanks for all of the suggestions.
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Old 11-07-2011, 06:26 AM   #36
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.... Does a new converter manage the batteries better than the Paralax that is currently installed.

Thanks for all of the suggestions.
You bet they do. The P-lax needs manual management and will over-charge if not monitored closely.
Our Classic came with ruined batteries from 24/7 hook-up.

Changed ours three Seasons ago, IOTA 55a IQ4 DLS, from Best Converter. Very happy with it. Give Randy a call.

Bob
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