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Bottlehead Crack, background humming noise?

post #1 of 11
Thread Starter 
Hi guys,

I recently bought a Bottlehead Crack and I paired it with Modi DAC. However, I can hear a slight humming noise coming out of the headphones (tried with my HD700 and UE900). Can anyone help me with this issue?
Thanks a lot! smily_headphones1.gif


Regads,
HC
post #2 of 11
Quote:
Originally Posted by SNSDluv View Post

Hi guys,

I recently bought a Bottlehead Crack and I paired it with Modi DAC. However, I can hear a slight humming noise coming out of the headphones (tried with my HD700 and UE900). Can anyone help me with this issue?
Thanks a lot! smily_headphones1.gif


Regads,
HC


You should post this in the Bottlehead Crack thread.  That thread is totally dedicated to the Bottlehead Crack.

 

Bottom line, there are many things that can cause hum in a true tube amp.  There may be something just in the way the wire was routed that's causing it.

post #3 of 11
Thread Starter 

Sorry about that and thanks for your help! :)

post #4 of 11

Or even better search the Crack thread on the Bottlehead forum..

post #5 of 11
Could be a ground loop, try unplugging the modi or your laptop and seeing if the hum disappears
post #6 of 11
Thread Starter 
Quote:
Originally Posted by EraserXIV View Post

Could be a ground loop, try unplugging the modi or your laptop and seeing if the hum disappears


Still exist, should I unplug my output and input tube and turn it on and check?

post #7 of 11

Try unplugging your rca interconnects from the crack twist them round each other as many times as is easy to do so and re connect. It worked for me. 

post #8 of 11

Make sure all the solders on your output tube are clean and there's maximum clearance between wires. I had this issue when I first built mine but it went away after going back and separating the wires best I could.

post #9 of 11
Quote:
Originally Posted by SNSDluv View Post

Hi guys,

I recently bought a Bottlehead Crack and I paired it with Modi DAC. However, I can hear a slight humming noise coming out of the headphones (tried with my HD700 and UE900). Can anyone help me with this issue?
Thanks a lot! smily_headphones1.gif


Regads,
HC

 

I didn't think those two headphones would work well with the crack.  The UE900 is only about 30ohms, and the HD700 150 ohms.  I was to the understanding that the Crack worked best with 250 and up.  I thought that caused noise but I just tried searching but I can't find where that causes humming, just distortion.

 

Oh well, I doubt that helped any.

post #10 of 11
Quote:
Originally Posted by Serenitty View Post
 

 

I didn't think those two headphones would work well with the crack.  The UE900 is only about 30ohms, and the HD700 150 ohms.  I was to the understanding that the Crack worked best with 250 and up.  I thought that caused noise but I just tried searching but I can't find where that causes humming, just distortion.

 

Oh well, I doubt that helped any.

My HE400s are addicted to  Crack :D more then my 880s (250omh) 

post #11 of 11
Thread Starter 
Quote:
Originally Posted by Serenitty View Post
 

 

I didn't think those two headphones would work well with the crack.  The UE900 is only about 30ohms, and the HD700 150 ohms.  I was to the understanding that the Crack worked best with 250 and up.  I thought that caused noise but I just tried searching but I can't find where that causes humming, just distortion.

 

Oh well, I doubt that helped any.

Crack works perfectly with HD700 :) It should just be anything from 150Ohm and higher. I remember somebody pointing out that the sweet spot for Crack is actually 150Ohms.. I think it's the HD700 review on Headfonia. 

And I figured out the noise now, it is due to my computer distortion. I put a wooden block between the two and the noise is gone, can't even hear any noise with my 16ohms headphones :P

Thanks for your help though!~ :D

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