Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: DirectAssault on December 19, 2017, 04:12:30 AM

Title: Need diagram with labels of Crack tube amp
Post by: DirectAssault on December 19, 2017, 04:12:30 AM

I bought the speedball upgrade for my Crack headphone amp, but in the instructions references checking the terminals between steps of installations. Which makes sense. Not an issue.

Unfortunately, I dont have my original document for the OTL and my terminals aren't labelled anymore (I removed the tape years ago) so I was wondering if anyone can share with me the locations of the terminals so that I can do the voltage checks when I install the speedball upgrade.

Thanks!

Title: Re: Need diagram with labels of Crack tube amp
Post by: fullheadofnothing on December 19, 2017, 04:38:31 AM

With the nine pin socket closest to you, the front terminal strip is numbered 1-5. The back terminal strip is numbered 6-10.

Title: Re: Need diagram with labels of Crack tube amp
Post by: DirectAssault on December 19, 2017, 04:43:37 AM

Thanks,

But the document for the voltage check refers to 'OA', 'IA', 'B-A/B', 'IB','OB', 'G', and 'B+'

Where are these?

Title: Re: Need diagram with labels of Crack tube amp
Post by: Paul Birkeland on December 19, 2017, 04:44:15 AM

Those labels are printed on the PC boards.

Title: Re: Need diagram with labels of Crack tube amp
Post by: DirectAssault on December 19, 2017, 04:50:04 AM

Right... zooming in on the image i can see the labels now.... i need bigger monitors.

Thanks