I've got an "interesting" intermittent noise that predominates in the right, front speaker of my 5.1 system. Often, it isn't there but suddenly, without any reason, it'll begin or end. It's a high, buzzing noise like what you'd expect to be generated from a fluorescent fixture. If I insert some sort of power conditioner in the system will that filter out this extra-musical interference?

Some info that may be pertinent: If I leave the powered monitors on but turn off the 950 and Pioneer 45A, the noise is still present. It isn't the hardware, I believe. It's the power supply, IMO.

Anyone have a clue? If I do need a power conditioner, what should that piece have to solve the problem?

Jay

You are probably picking up EMI noise from a dimmer, refridgerator or something like that. I use TrippLite "Isobar" power line filters. They are among the best there is, and since they are basically aimed at professional/industrial users, they do not have the "hype tax" of inflated price.

http://www.tripplite.com

Anybody know if tube amps are more prone to buzzing than solid-state? More often (than solid-state amp) reviewers mention how silent it is while on pause as part of their evaluation. Also, are the causes likely be the same as solid-state amp buzzing?

Thanks.

Tubes would be more succeptable to picking up airborne RFI and EMI because the working impedances of the internal circuitry is very high in relation to that in a solid state component. Therefore, you should take more care in power line filtering and location of tube based equipment.

soundhound:

Thanks for the feedback. But any filtering restricts power requirement for amps during demanding situations as discussed in “Line Conditioners…” thread. How would one deal with this?

Because of the much higher power supply voltages used in tube amps, the storage capacity of power supply energy (measured in joules) is much higher than any solid state amp. Therefore tube amps will have much more power supply storage headroom than a solid state one. This overcomes the AC power issue.

A solid state amp would have to have an impractically high amount of capacitance in the power supply to match the effective storage of a tube amp.

[This message has been edited by soundhound (edited March 18, 2004).]

Would you power a 100W class AB tube amp and a SS amp 300W-400W (4 ohms) through one Isobar line conditioner on a dedicated 20 amp line or run them separately on separate line conditioners on 2 separate but balanced 20 amp outlets. If it's the latter, I will have to go and buy yet another thing.........

You could plug both into the Isobar, although I only use a surge protector on my solid state amp (which powers my subs).

I don’t know soundhound. It did more to it then for it when plugged it into filtered power outlet.

I finally got a pair of mono-block s.e.t. tube amps and first plugged them into outlets with surge protection only. It sounded good but noticed a faint buzz during pause from about 2 feet away. I wouldn’t call it a problem because it isn’t audible from my listening position but I thought I should try a different set up to see if the power I’m getting isn’t all that clean. So I plugged them into my Panamax’s filtered outlets and I’ve learned two things from this. One, I do not have dirty power problem or even if I do, it wasn’t the cause of buzzing. Two, filtered power does hider the performance of tube amp because it sounded like they just got a shot of tranquilizer. When I plugged them back into non-filtered outlet, the sound came alive again.

From what I read soundhound, you have your tube amps plugged into filtered power outlets and you don’t have problems like mine? If so, I’m confused.

My power amps are only plugged into a surge protector at the present time.

Hum heard through Speaker People,

Sounds like Outlaw equipment is susceptible to hum/buzz through the speakers just like my Adcom stuff. When I disconnect the cable TV the hum stops. I had this same problem at three houses. I checked it out and learned that it's due to multiple ground paths (electrical plus cable). I think also that AC is being carried by the cable TV cable and entering my system because the hum is about the 60HZ variety. No cable guy has ever solved the problem. I tried something I read and it worked: On the cable, I went from 75 Ohm to 300 Ohm and back to 75 Ohm... That cut the noise out (but read on). In one of my houses, this only worked if the adapter set was installed at the box where the cable enters the house. During a routine inspection, my cable guy took my adapters out of their box. I went to RadioShack for a replacement and installed. This time the noise was still present. I did obtain my adapters from the cable guy (whew) and found that the certain 75 Ohm to 300 Ohm adapter I was using has a resister within it that the RadioShack model does not. So the conversion is not the solution, but the in-line resister is. I cannot see a difference on my TV with and without the adapters and broadband cable works after the splice as well. http://www.elect-spec.com/video.htm ...I wonder if something like that would work as well. I've never found another 75 Ohm to 300 Ohm adapter that includes a resister except in the one I have that I got in Japan. Speaking of resisters, I had big Yamaha Amps (250 Watt) before American made amps. The Yamaha's were quit and never passed on the hum/buzz, but they didn't have near the punch and control (damping factor) that present amps have. My brother is considering Outlaw, so I came to check you out. I saw this post and know what a headache the hum is so I had to tell my story.