[SNSDluv]

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!


Regads,
HC

 

[tomb]

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!

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.

 

[SNSDluv]

Sorry about that and thanks for your help!

 

[mcandmar]

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

 

[EraserXIV]

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

 

[SNSDluv]

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?

 

[JamieMcC]

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. 

 

[Phait]

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.

 

[Serenitty]

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!

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.

 

[spacequeen7]

   
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

 more then my 880s (250omh) 

 

[SNSDluv]

   
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

Thanks for your help though!~