Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: kagt on August 28, 2016, 05:11:56 PM

Title: Help trouble shooting crack
Post by: kagt on August 28, 2016, 05:11:56 PM

So, I recently jsut finish building my crack everything looks good but there is a weird base sound coming out of the left channel when there is a slight vibration. I have my crack on my computer table but when I type there is a weird base sound. Help would be appreciated thanks.

Title: Re: Help trouble shooting crack
Post by: Paul Birkeland on August 29, 2016, 06:11:07 AM

This might just be a little bit of tube microphony.  If you tap on either tube with your finger, do you get the same sound?

Title: Re: Help trouble shooting crack
Post by: kagt on August 29, 2016, 07:47:18 AM

Sounds like it. What should I do to eliminate the problem?

Title: Re: Help trouble shooting crack
Post by: Paul Birkeland on August 29, 2016, 03:22:10 PM

There's no harm to it.  You can move the Crack away from your keyboard, get a different 12AU7, or put some weight on top of the power transformer.

Title: Re: Help trouble shooting crack
Post by: kagt on August 29, 2016, 04:18:12 PM

Thanks, I'll try to get a different tube.