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Little Dot I+ noise level help

post #1 of 5
1/23/12 at 11:57am
Thread Starter 

 I recently bought a little dot I+ tube with Sylvania 408A tube. I first listened with it connected to K702 and really enjoyed it. It is dead quiet when music is not playing or when the volume is turned all the way down. A few days later, I borrowed some Beyer DT1350 to listen with Little dot and started to hear some noises. I heard these noises when the headphone is plugged into the amp, even if the amp is not connected to any source. The noise sounds like small hiss or buzz and is very very subtle, but audible. The DT1350 is dead quiet with my ibasso D6 or IPOD directly so I know it is not the headphone. I swapped some WE 408A tubes and the noise sounds the same. I wonder if these noise is pretty normal or is the amp faulty? Like I said, the noise level is very low, but it is there when DT1350 is plugged in. Anyone can help me on this? Thanks.


Edited by andychen - 1/24/12 at 11:24am
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post #2 of 5
1/24/12 at 11:24am
Thread Starter 

Anyone can help? I just want to know if this is like the baseline noise of Little dot I+. Thanks.

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post #3 of 5
1/24/12 at 6:36pm

At what gain setting do you have the LD I+ set: 3.5 or 7?

http://dl.dropbox.com/u/6037680/Little%20Dot%20I%2B%20Reference%20Guide.pdf

 

Also, consider adding two 0.1uF capacitors between the bases of the two output transistors.

http://audiokarma.org/forums/showthread.php?t=274126


Edited by Tribbs - 1/24/12 at 6:37pm
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post #4 of 5
1/24/12 at 8:42pm
Thread Starter 

Thanks. The gain setting is 3.5. My soldering skill is not very good, so I would prefer not to do that.

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post #5 of 5
1/25/12 at 5:36am

Try cleaning the pins on your tubes or just re-insert them in and out a few times.

Beyond this suggestion I don't know what else to suggest.

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