Amplifier Hum |
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Amplifier Hum |
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May 30 2015, 06:34 AM |
We certainly woudn't want to impede your manhood! What you are talking about here is your basic 60hz hum that is enough to make one want to go nuts now and again. The good news is that there are several devices just for this problem.
The most affordable is from, of course, BEHRINGER!! The "Hum Destroyer" http://www.behringer.com/EN/Products/HD400.aspx The next step up is the "pro" option, the HUM ELIMINATOR http://www.ebtechaudio.com/hedes.html hope this helps Anyone else? |
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May 30 2015, 03:52 PM |
Some airy hiss yes but not hum.
I too only play through tube amps though some are of the smaller variety. I have many from several eras. The oldest being from probably 1941 and the newest from 2012. None of mine 'hum' at 60 or 120 cycles - that's a wall power thing or something in the amp (tubes, caps, trannys) affected by and related to the wall power. It's probably just dirty power in your house/neighborhood. Does that hum slowly 'phase' or slightly change frequency? That's TV station interference which is 59.95 HZ Is the hum there and/or the same when you take your amps somewhere else? This post has been edited by klasaine: May 30 2015, 03:56 PM -------------------- - Ken Lasaine
https://soundcloud.com/klasaine2/foolin-the-clouds https://soundcloud.com/klasaine2/surfin-at-the-country-hop Soundcloud assorted ... https://soundcloud.com/klasaine3 New record ... http://www.cdbaby.com/cd/kenlasaine Solo Guitar ... https://www.youtube.com/playlist?list=PLXZh...5iIdO2tpgtj25Ke Stuff I'm on ... https://www.youtube.com/playlist?list=PLXZh...b-dhb-4B0KgRY-d |
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May 31 2015, 04:36 PM |
A lot of recording studios use 'ferrite rings' ... https://www.google.com/search?q=ferrite+bea...=ferrite+toroid
They definitely work a lot of the time to eliminate hum coming from radio stations, TV stations, power grid rely stations, the neighbor's juicer, etc. This is another possible solution. I've had good luck with them ... http://www.tripplite.com/products/series/sid/825 This post has been edited by klasaine: May 31 2015, 04:36 PM -------------------- - Ken Lasaine
https://soundcloud.com/klasaine2/foolin-the-clouds https://soundcloud.com/klasaine2/surfin-at-the-country-hop Soundcloud assorted ... https://soundcloud.com/klasaine3 New record ... http://www.cdbaby.com/cd/kenlasaine Solo Guitar ... https://www.youtube.com/playlist?list=PLXZh...5iIdO2tpgtj25Ke Stuff I'm on ... https://www.youtube.com/playlist?list=PLXZh...b-dhb-4B0KgRY-d |
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May 31 2015, 08:50 PM |
Good call! I've got one of these isobar units and they are quite handy. Kills lots of house hum The little one is less than $50 online. I've got a power strip/rack plugged in to it for power distribution.
http://www.tripplite.com/surge-protector-i...lack~ULTRABLOK/ A lot of recording studios use 'ferrite rings' ... https://www.google.com/search?q=ferrite+bea...=ferrite+toroid They definitely work a lot of the time to eliminate hum coming from radio stations, TV stations, power grid rely stations, the neighbor's juicer, etc. This is another possible solution. I've had good luck with them ... http://www.tripplite.com/products/series/sid/825 |
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Jun 1 2015, 03:26 AM |
No, I am am talking about 120hz hum. 60hz hum would most likely be caused by a faulty tube.
Yes the house current is 60hz, at least in the US. Visually this is a sine curve with a parabolic peak and dip each cycle. The rectifier converts this so that the peaks are all on the same polarity, usually positive, so you end up with 120 peaks per second on one polarity, rather than 60 positive peaks and 60 negative dips per cycle. Thus you have 120 cycle DC current, i.e. 120 peaks on the same polarity every second. Then your filter capacitors smooth this out to avoid a 120 cycle hum. Eventually these dry out, which is why older amps often develop a hum. Regarding my house current, as my other amplifiers do not have this issue, I think I can disregard that as the cause. The devices used to clean your house current deal with an entirely different issue than this. Those devices won't help a thing here. You cleanest power will still have hum when your amplifier's filter capacitors are not doing their job as they should. I got this Bugera cheap because it was a return, but with manufacturers warranty. The odd thing is that the amplifier is 6 years old. I looked inside to see that the modification had been made to deal with the early Bugera's melting at the transformer interface. Saving a few bucks was not worth my house burning down. That modification had been made. Actually it looked fine inside, as Eurotubes has said, they use components that are average for amplifiers today. It is a myth that they use total junk components. But it has a little 120 cycle hum. It is a 6262, which is a Peavey clone. My 333 (also a Peavey clone) does not have this hum at all. So if I was to theorize, I expect that this thing was stored somewhere all those years, probably in a place that got too hot, and the filter capacitors dried prematurely. Or perhaps it was a demo and they did not use the standby switch as one should. Many people have no idea what the standby switch is even for. I don't know where MusiciansFriend gets all of these, but I suspect they acquire them from numerous sources. The hum is not real loud, not that big a deal, and the amplifier sounds kick ass. Really picks up pinch harmonics nicely, best amplifier I have had for that. I probably will send it back and ask for an exchange. Or perhaps I will just buy another and think about keeping this also, as I did get it pretty cheap. MusiciansFriend is unloading their old models now at half of what they used to cost, the new models have autobiasing, but I don't need that, I bias my own amplifiers. Yes there are some other advantages and options with autobiasing, but it has another big disadvantage, it is just another unnecessary thing to go bad, that when it goes bad may turn your amplifier into a big door stop. The Bugeras are a hell of a good sounding Amplifier, you just have to send more of them back than with some other brands. And they do have a 3 year warranty. I contacted Bugera to make sure that the warranty was good, and they were good about responding. I suspect that they support their product better than some might believe. Regarding my manhood, there is a reason I restrict myself to tube amps and some stomp pedals, and stay away from other crap, with that restriction if forces me to keep it simple, and it keeps me focused rather than distracted. We live in a world with resources unimagined a few years ago, but also we live in a world where for the most part people get lost in a world of useless nonsense and trivia because all the distractions level them snow blind. But that is another story. We certainly woudn't want to impede your manhood! What you are talking about here is your basic 60hz hum that is enough to make one want to go nuts now and again. The good news is that there are several devices just for this problem.
The most affordable is from, of course, BEHRINGER!! The "Hum Destroyer" http://www.behringer.com/EN/Products/HD400.aspx The next step up is the "pro" option, the HUM ELIMINATOR http://www.ebtechaudio.com/hedes.html hope this helps Anyone else? This post has been edited by fkalich: Jun 1 2015, 04:40 AM |
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Jun 1 2015, 04:39 PM |
Well, if it really is 120 hz noise then it's a filter cap but as Todd mentions, w/o actually hearing it we can't really know anything.
*120 hz is right in between Bb and B. -------------------- - Ken Lasaine
https://soundcloud.com/klasaine2/foolin-the-clouds https://soundcloud.com/klasaine2/surfin-at-the-country-hop Soundcloud assorted ... https://soundcloud.com/klasaine3 New record ... http://www.cdbaby.com/cd/kenlasaine Solo Guitar ... https://www.youtube.com/playlist?list=PLXZh...5iIdO2tpgtj25Ke Stuff I'm on ... https://www.youtube.com/playlist?list=PLXZh...b-dhb-4B0KgRY-d |
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