2. amps-preamps
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Static from tweeters, preamp?

I get audible static from my tweeters upon plugging in my onkyo p-308 preamp. Bad power supply, bad capacitor???? Poor solder joint?

There is very minor static, when preamp is unhooked. I plug it in and the static gets louder, much more noticeable. From what I remember, by B&K pro 10 mc also does this. B&K has 3 prong grounded, onkyo has 2 prong standard. When I used my Sunfire sig, I had no noise at all. It is a reg 2 prong plug. Help
128x128arctikdeth
dweller's avatar
dweller
2,152 posts
 
Is any equipment new? I had some static issues with my new equipment for a month or two. It finally went away.
arctikdeth's avatar
arctikdeth OP
99 posts
 
My monoblocks are 3 prong grounded plugs, preamp is two prong ungrounded, as is DVD player, cable box, TV. It is a static noise, not a ground loop low freq hum. Bad op amp? Preamp going bad, it is an old unit from the early 90's. I will be getting the sanders sound preamp in a few weeks, I'm praying it is the preamp.

All plugged now into a furman pl-plus C conditioner.

I had my other odyssey monoblocks hooked up to same upstairs set up, and sound Was still audible. Moved B&K pre upstairs, same noise. Basement setup now has odyssey amps , B&K pre, no noise, only sometimes. Maybe I'll check to see if the furnace is on, when I hear the noise. I'm at a loss as to what it is, I'm hoping it's the preamp, needs to be retired anyway.
lowrider57's avatar
lowrider57
3,018 posts
 
Are you plugging in the preamp with the Furman PC power OFF?
You should be.
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