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Post subject: NEW TUBES FOR BLUES JUNIOR & IT STILL HUMS.
Posted: Mon Apr 27, 2009 10:34 am
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Hi All,
Well from my previous post, I bough all new tubes for my blues junior, I went with the Slovek replacements. I took out the old/stock tubes and replaced them all with the new ones. I thought maybe the hum would be gone, completely. But when I turn it on, after about 5 seconds the hum starts, I plug in my guitar, the hum is still there. I begin to play and you can't hear the hum, however, when I stop playing, I can hear the hum. I would say it's not super loud, but it is noticable. I've tried using surge/power strips and different outlets as well. But when I do play, the new tubes sound really good. So, does anyone else have this type of hum??? And is it something to even worry about?

thanks.

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Posted: Mon Apr 27, 2009 11:46 am
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I've got a Pro Junior, which is exactly the same as a BJ save for the bigger speaker and more controls -- the amp itself is the same. Mine does hiss (not hum; is that what you have?) a little bit, and I think it's just a fact of life when you've got a small tube combo. One thing you could try is getting some electrical contact cleaner and putting that on the prongs of the tubes, and then working them in and out of their sockets a few times. You could also clean the pots if you desired. If it's not a bad noise, however, I wouldn't bother. It may be noticeable in your basement, and it may even infuriate you, but it's generally not a big deal.


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Posted: Mon Apr 27, 2009 11:53 am
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It could be described as a hiss as well, like I said, when I play the amp sounds great. But when I stop you can hear it, it's not really loud, but noticeable. I'll just leave it all alone.
I wasn't sure if the amp when turned on should be perfectly quiet or if this hiss/hum is something that is normal.

thanks for the input.

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Posted: Mon Apr 27, 2009 12:05 pm
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My 5F1 does the same. Dont think there's a way around it. Too much other electronics in proximity.


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Posted: Mon Apr 27, 2009 12:54 pm
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It's caused by dirty electricity. I put in a dedicated circuit for my amp.

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Posted: Mon Apr 27, 2009 1:23 pm
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Quote:
It's caused by dirty electricity. I put in a dedicated circuit for my amp.


Chet, how do you go about doing this?

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Posted: Mon Apr 27, 2009 1:32 pm
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hottrod wrote:
Quote:
It's caused by dirty electricity. I put in a dedicated circuit for my amp.


Chet, how do you go about doing this?


If you look at the fuse box for your house you will see that complete rooms or sections of a house are on the same circuit. A dedicated circuit is when a single plug in is run from the fuse box. Refrigerators and Air Conditioners are usually run on a dedicated circuit in newer houses. A couple of years ago we had some electrical problems (we live in an older mobile home) and when the Electrician was here we had dedicated circuits run for our frig and ac. While he was here I had him run a dedicated circuit for my amps too!!!

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Posted: Mon Apr 27, 2009 1:37 pm
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Bad filter caps can cause hum too. If it's under warranty, take it to a tech.


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Posted: Mon Apr 27, 2009 1:40 pm
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[/quote]Bad filter caps can cause hum too. If it's under warranty, take it to a tech.
Quote:


I have a week old Texas Red Blues Jr. and the hum isn't that bad, I was just wondering if there was a simple and inexspensive way around it. But I guess it comes with an all tube amplifier.

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Posted: Mon Apr 27, 2009 1:47 pm
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I've had mine for 5 years, so I'm sure the warranty has expired. And I'm not even sure where the filter caps are located.

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Posted: Mon Apr 27, 2009 3:38 pm
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nic- My BJr is virtually silent at home volumes, stock tubes, much quieter than my SS. When I bought my first amp it hummed a lot. The outlets in my house are not grounded so I ran a light single conductor wire, half of a home stereo speaker wire, from the cover screw on the outlet I use for amps out the window to a nearby hose bib. I fastened the end of the wire to the screw that holds the handle on the bib. Problem solved. Connecting a wire from your outlet box to any metal part of your plumbing system will most likely ground your outlet if it is not already. Most home wiring was grounded around maybe 1960. You might want to talk to someone about basic home wiring. You can buy outlet testers that tell if your outlet is grounded for about $5.


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Posted: Tue Apr 28, 2009 2:41 am
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I have never heard a completely silent tube amp. There was always background hiss which gets louder as you turn up the volume/gain.


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Posted: Tue Apr 28, 2009 4:08 am
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Grant1,
Sounds easy enough to do, I'll give it a try tonight to see if it helps and report back.

thanks.

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Posted: Tue Apr 28, 2009 5:12 am
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I reduced the hum in my Blues Junior by twisting the power transformer leads together. I did it when I had the back off to do the BillM mods. It's easy to do. Just see the BillM page where he describes how to remove and replace the circuit board. It made a substantial improvement.

You can do it yourself or have somebody else do it. If you have the BIllM mods done - which I recommend highly - he'll do it at the same time he does the other mods. I did the mods myself - it wasn't too difficult.

See the bottom of this page:
http://billmaudio.com/wp/?page_id=17&cpage=2

Good luck.

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Posted: Tue Apr 28, 2009 5:30 am
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How old is your amp? Did your amp always hum?


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