Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: smallmany on March 29, 2014, 07:34:56 AM

Title: Loud Screech starting up
Post by: smallmany on March 29, 2014, 07:34:56 AM

I leave my headphones plugged when I start my amp, and I noticed it makes a sound like a nail is being scratched across a blackboard.
Is this normal

Title: Re: Loud Screech starting up
Post by: smallmany on March 29, 2014, 07:38:52 AM

Amp is not connected to source and at quarter turn on the pot when its fired up.

Title: Re: Loud Screech starting up
Post by: Paul Birkeland on March 29, 2014, 08:49:31 AM

Does this only happen when it warms up?

Some tubes will sputter just a little bit while warming up, this isn't particularly abnormal. 

Title: Re: Loud Screech starting up
Post by: kscwuzhere on March 29, 2014, 01:06:07 PM

I used to have an extremely loud popping/crackle sound when plugging in my headphones and solved the issue by checking the grounding path and making sure that I had no cold solder joints. After I found which ones did, I re-soldered and the crack was back to normal. There's a sticky thread about the Crack's grounding path, I'd check that out.