[jona.p]

Hello,

I turned on my DV336i today and noticed a hiss, which comes and goes in my right channel, was wondering if someone could help me a bit on how I can solve this. Im using the stock tubes in them still. To solve the groundloop issue Im currently using a cheat plug (without the ground)..

I tried reinserting the tubes, but after about 3 minutes the hiss comes back

. It sounds a bit like the wind, sometimes its louder and then its a little less loud and then its completely gone.

Any feedback is much appreciated!

Regards
jona

 

[nick20]

Your best bet is to play some pink-noise for 24 hours. Usually the "buzz"/"hum" is gone after that time. Rarely is it still there, in which you would continue to run pink-noise until the "noise" is gone.


Generally, after 24-48 hours, the "noise" is gone, but some tubes can take upwards of 100 hours to resolve the problem.


Also, as your amp gains hours, and age, these problems become less and less problematic.






-Nick

 

[jona.p]

Thanks for the quick reply!

Well, I think it's burned already, I've been using it for 3 weeks with a minimum of ~3 hours a day. Always playing music, this hiss is new

. I had a hum when I first booted it up, was a different sound from what I get now and I knew then that the hum would disappear with time, it did after about 1 hour;o.

I really hope its the tubes that are making this sound, wouldn;t mind tube rolling ;P.

 

[nick20]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif Thanks for the quick reply! Well, I think it's burned already, I've been using it for 3 weeks with a minimum of ~3 hours a day. Always playing music, this hiss is new . I had a hum when I first booted it up, was a different sound from what I get now and I knew then that the hum would disappear with time, it did after about 1 hour;o. I really hope its the tubes that are making this sound, wouldn;t mind tube rolling ;P.

Are you using stock tubes?

Is this "noise" in the original tube that had other "noise" in the beginning?




The tubes are likely the culprit here.. I would say another 200 hours before your DV is fully burnt-in. I think I am close to 750-ish on mine.

 

[jona.p]

Yes, I;m still using the stock tubes, it was also these tubes that had the hum in the beginning. I read somewhere that this is quite normal, the hum at first boot.

woah, another 200 hours? pfff I dunno if I can wait that long for the hiss to disappear!;p

 

[nick20]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif Yes, I;m still using the stock tubes, it was also these tubes that had the hum in the beginning. I read somewhere that this is quite normal, the hum at first boot. woah, another 200 hours? pfff I dunno if I can wait that long for the hiss to disappear!;p

It is quite normal. And is normal for this problem to go away at/around the 48 hour mark, if its not already gone. There has been a few instances where it prolonged even further. I had a tube that took about 90 hours to complete it's "burn-in".

I meant another 200 hours before your components are burnt-in. Not the tube. I think its the components that may be doing something to the tube, to make it make an irregular "noise".

Since owning mine, and putting on a lot of hours, I have not yet had this problem on NOS or used tubes as of late. No problems at all. However, when I first owned my 336i, I had similar problems as you.

My first encounter was when the "noise" was in both channels. After about 24 hours, it shifted solely to the left side. After another 24 hours, it was completely gone from the left channel, and into the right one now. Finally, after another 24 hours, it was completely gone.

Again, this is not common. Usually after 48 hours of pink-noise, the "noise" problem is gone.






Good luck..


-Nick

 

[jona.p]

Heh, I guess i'll just pray it's not any of the components failing

.

Just noticed, the hiss doesnt get louder when I tturn the volume all the way up ( on the amp ).

Thanks !

 

[nick20]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif Heh, I guess i'll just pray it's not any of the components failing . Just noticed, the hiss doesnt get louder when I tturn the volume all the way up ( on the amp ). Thanks !

Moreso, it's the components being burnt-in. Not failing.


Report back to us after 48 hours of pink-noise.

 

[jona.p]

Ok, Thanks again! ;P

 

[Penchum]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif To solve the groundloop issue Im currently using a cheat plug (without the ground)..

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif Heh, I guess i'll just pray it's not any of the components failing . Just noticed, the hiss doesnt get louder when I turn the volume all the way up ( on the amp ).

I always get concerned when I see a cheater plug is being used. Noise problems and grounding problems get harder to solve. If you purchased one of these Search Results Page depending on your power cord size, you could dump the cheater plug and see if any noise clears up. Also, make sure your other components are plugged into the same outlet as your amp. This prevents any "house" grounding issues from creating noise.

Good Luck!!

 

[zoomjohn]

I've had this experience, even with a used tube. One of my 6AS7's has a very strong hiss on the left channel that has to do with the way the tube is plugged in, when I carefully 'roll' it a little bit to one side, the noise totally disappears.

 

[nick20]

Quote:

Originally Posted by zoomjohn /img/forum/go_quote.gif when I carefully 'roll' it a little bit to one side, the noise totally disappears.

Hence "tube 'rolling'"

 

[jona.p]

Quote:

I always get concerned when I see a cheater plug is being used. Noise problems and grounding problems get harder to solve. If you purchased one of these Search Results Page depending on your power cord size, you could dump the cheater plug and see if any noise clears up. Also, make sure your other components are plugged into the same outlet as your amp. This prevents any "house" grounding issues from creating noise. Good Luck!!

I really want to ground my amp also but the ground loop noise I get when I use the grounded plug is really bad, I can hear my harddisck rattle trhough my phones I can hear every movement I make with my mouse ;o + then some more static noise thats always there.

Since they are so cheap I think Ill try one of those cord suppressors. I however doubt itll fix al the garbage I get through the ground, is there maybe a ground loop fix on the power cord instead on the cable from my source to my amp, apart from the supressor im gonna get?

 

[nick20]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif I really want to ground my amp also but the ground loop noise I get when I use the grounded plug is really bad, I can hear my harddisck rattle trhough my phones I can hear every movement I make with my mouse ;o + then some more static noise thats always there. Since they are so cheap I think Ill try one of those cord suppressors. I however doubt itll fix al the garbage I get through the ground, is there maybe a ground loop fix on the power cord instead on the cable from my source to my amp, apart from the supressor im gonna get?

Maybe try some isolation devices, and tube dampers.


This has fixed it in my case.

 

[Penchum]

Quote:

Originally Posted by jona.p /img/forum/go_quote.gif I really want to ground my amp also but the ground loop noise I get when I use the grounded plug is really bad, I can hear my harddisck rattle trhough my phones I can hear every movement I make with my mouse ;o + then some more static noise thats always there. Since they are so cheap I think Ill try one of those cord suppressors. I however doubt itll fix al the garbage I get through the ground, is there maybe a ground loop fix on the power cord instead on the cable from my source to my amp, apart from the supressor im gonna get?

I've been looking for the ones that can be used on RCA cables, but I don't think they differ from the ones used on power cables. Maybe the smallest at that site might fit your RCAs??