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Hum in one speaker?

Hi, ive been having this hum thats been comming out of my right magnapan speaker. Well first thing is that my whole system is on the right side of the room and the speaker is right next to the equipment but its been like this for years and I never had a hum before. This seems to happen when using the turntable but only with certain albums that have been recorded at a low levels causing me to turn up the pre amp past 12o clock. Recently I put my speakers on mye stands with magic sliders and I dont know if that may have caused an issue or mabey its a bad vaccume tube? I tried moving the speaker around the room didnt seem to do much but the hum seems at its worst at the best listening spot (go figure). Mabey its my cartridge? I dont know but right now my turntable is about 30 inches away from the speaker. The hum is not horrible but when the music gets quiet it can be annoying. I did swap the speakers and with the tweeters on the outside the hum seems to be worse not better.
barruch86
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tom32
33 posts
 

Sounds like you had some schmutz on your connection. One of the symptoms will be that you will pick up more noise (including hum), and another symptom is that it will be sensitive to vibration (tapping on it makes it cut in and out).

The schmutz causes a high impedance connection, which still can couple in the signal, but the high impedance connection becomes more susceptible to pickup of stray magnetic fields. It's like you created an antenna.

The high impedance connection of the dirt also creates a variable resistor, which changes value under the pressure of vibration. The vibration causes changes in connection impedance and often causes a crackling noise as it changes value. Vibration of the surface the preamp is sitting on becomes modulated into the signal through this variable connection. It is one form of what is commonly called "microphonic noise".

Clean your connectors. I use rubbing alcohol.
barruch86 OP
28 posts
 
Mental ahah yea sometimes I make no sense either lol. Yea its or it was a small hum that came out of the right speaker only when the volume was turned up to a specific level. That level being very loud past 12 o clock. The hum would get stronger the higher up past 12 o clock. I very rarley go up that high but some records are recorded pretty low or I just like the music so much i have the urge to crank it up lol. Anyway it is possible that the interconnect wasnt completely in there and it got pushed in place when I was moving things around. Tom32, wow thats very informative and great idea, ive never cleaned the connectors, im shure my old sp8 is pretty dirty. Again thanks, you guys are the best!
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