Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: mrying on August 06, 2015, 04:49:19 PM

Title: Crack Ticking Noise/ Microphonics [resolved]
Post by: mrying on August 06, 2015, 04:49:19 PM

Hi everyone!!  :)

I just finished building my crack amp. When I plug in my headphones into the crack there is a ticking noise and a bit of microphonics on the right channel of the headphones. It is still there when I turn the volume all the way down, I tried to unplug the Rca interconnects and when no source is connected.

Not sure what is causing this?

Thanks a lot!!

 :) :)

Title: Re: Crack Ticking Noise/ Microphonics
Post by: Strikkflypilot on August 06, 2015, 08:08:17 PM

Did voltage and resistance tests check out?

Title: Re: Crack Ticking Noise/ Microphonics
Post by: Grainger49 on August 06, 2015, 11:43:35 PM

The proper way to assess noise with no input is to short the inputs.  Either use a shorting plug as Doc describes here:

http://bottlehead.com/smf/index.php?topic=586.0

. . . or use jumpers on each channel.  Those would go from the center conductor to the ground tab.  This eliminates all outside influences.

Title: Re: Crack Ticking Noise/ Microphonics
Post by: mrying on August 07, 2015, 03:28:33 AM

yes the Voltage and Resistance test has been done. Everything seems fine. Weird because after a good hour or so the ticking and micro phonics were gone. I am guessing the tubes warm up and the sound went away. The background was pitch black after the hour. I will test it out again tonight and see if the tubes have to warm up first?

Thanks guys for the replies!  :) :)

Title: Re: Crack Ticking Noise/ Microphonics
Post by: Paul Birkeland on August 07, 2015, 07:35:40 AM

Quote from: mrying on August 06, 2015, 04:49:19 PM

there is a ticking noise

This is often your cell phone interfering.

-PB

Title: Re: Crack Ticking Noise/ Microphonics
Post by: adydula on August 09, 2015, 01:59:57 AM

I had my crack near my wireless router and heard lots of clicking and strange noises.....moved it a few feet away and the clicking goes away....lots of external things can induce nosie
into the crack.....

Alex

Title: Re: Crack Ticking Noise/ Microphonics
Post by: mrying on August 11, 2015, 09:34:19 AM

Thanks guys, I do think it is the cellphone and wifi signal. My router is literally right beside the amp!!

Thanks for the input!!

Ying :) :)