I hope somebody can help me with this problem. From time to time I get an electronic or mechanic hum from within my RB 1552(It may come from the trafo) it is not comming through to the speakers, it's on for a second or to and then gone fore a few more seconds, and then recycles with the same interval. Sometimes the hum gets lower in volume everytime it recycles and sometimes it stays the same. When the hum starts it go's on for the whole evening and sometimes it's gone after an hour? Help please.
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Toroid transformers can hum if there is DC offset on the AC line and if that's your problem some people have made it stop by using a plug-in DC blocking device. http://sound.westhost.com/articles/xfmr-dc.htm
Sometimes mechanical hum from a toroid can be made to go away or become inaudible by loosening the nut on the center bolt and rotating the transformer slightly, then re-tightening. Depending on how much slack there is on the transformer wires, you may only be able to rotate it a degree or two, but sometimes that is enough to help alleviate the noise.
Steve -
Thanks SrB
Tthat is very helpfull. I will at some point, try to turn the trafo and see how that goes.Comment
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I'm sure everybody will be excited to know that the new Classic gear from Parasound is now available to order. They released it this week with much anticipation.
A typical 7 channel setup will consist of the 7100, 5125 and 2125. This will cost $5,500 MSRP and be fully THX Ultra II Certified.... -
Parasound has put out a new press release on the JC-2. While you're over there, you may want to check out the rest of their PR website--lots of good info there. New stuff on the JC-2, pictures of the JC-2, D3, and other stuff in the "Photo Library", etc.
http://www.gspr.c... -
Hi,
I recently purchased the A51, and I am getting a hum from the transformer. The hum comes directly from the A51 unit and not through the speaker (it's not a ground loop problem). I send the A51 back to Parasound for repair and they replaced the transformer (very good technical support... -
The power transformer in one of my two JC-1's has a 60 Hz mechanical hum loud enough to notice 20 feet away. The other JC-1 is perfectly quiet. The amps are a year old but have had the problem since they were new.
I called Parasound's service dept. a year ago. The service rep told... -
sorry to dig up such an old thread! but i have transformer hum and am planning to implement the dc blocker tonight. i intend to use 4 1n4004 (1a 400v) diodes and 4 2200uF 16v electrolytic caps in a similar manner to this, however i will parallel 2 caps to get 4400uF on each half (since i couldn't find...
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