Adcom 5802 after warm up
acmf74
Posts: 936
Folks...
I use my 5802 for HT and 2Ch music. As of recently, after it warms up I hear a "humming" coming from the amp but its not audible through the speakers. I suspect something may be going on it/needs repair.
Ironically the music and HT sound fine.
Anyone have a similar experience?
tia
I use my 5802 for HT and 2Ch music. As of recently, after it warms up I hear a "humming" coming from the amp but its not audible through the speakers. I suspect something may be going on it/needs repair.
Ironically the music and HT sound fine.
Anyone have a similar experience?
tia
Post edited by acmf74 on
Comments
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I've had it with my McCormack. Intermittent. Seems to be related to bad wiring in my apartment. Could also be transformer lamination, as Kim says. You should take a look at this thread:
http://www.polkaudio.com/forums/showthread.php?160855-B-amp-K-monoblocks-humming
Starts off talking about buzz through speakers, meanders over to useful discussion re: amplifier (transformer) hum and fixes.
This might help too (from the linked thread):
http://www.diyaudio.com/forums/solid-state/2080-dc-filter.html
Not sure about the DIY (above my pay grade), but some good explanations.Marantz CD6004
Adcom GFP-750
McCormack DNA-1
Polk LSi9s
Signal Cable ICs
Blue Jeans cables -
One of my GFAs had some weak/cold solder joints...once those were corrected, hum was completely gone."Some people find it easier to be conceited rather than correct."
"Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip -
All excellent sugestions as to the noise source. If it comes and goes, it probably is the power transformer responding to noise on the power lines. Any flourescent lights on or dimmers nearby? Did the refrigerator or A/C just kick on?
If the amp just has to be on and the noise is always there at pretty much the same level, I would check for cold solder joints in the power supply section - especially around the rectifier diodes.
hth
