Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: EnsgnofIndustry on August 05, 2023, 11:39:15 AM

Title: S.E.X. Completed hum Resolved but problems with C4S install
Post by: EnsgnofIndustry on August 05, 2023, 11:39:15 AM: I had posted below about hum. Ultimately, I went back into the kit and re-soldered all the joints with a cranked up iron. I'm used to circuit boards, so I'm usually not too aggressive with a hot iron. In any case, the hum disappeared with the re-solder, and I had a good 3 weeks of regular listening with phones and speakers. Sounded great.

I just installed the C4S mod as per instructions (I think), and upon plugging in the amp to test voltages, I heard a loud crack. I quickly unplugged the amp and didn't see where the arc came from, but the Right Cap looks like it was damaged. The fuse remains intact. I have attached photos of the build. Not sure what happened. Do you see anything askew? Happy to take more pics.
Title: Re: S.E.X. Completed hum Resolved but problems with C4S install
Post by: Thermioniclife on August 05, 2023, 01:48:56 PM: It looks like in the first pic you laid the body of the iron against the cap and it could be directly shorted.
Title: Re: S.E.X. Completed hum Resolved but problems with C4S install
Post by: Doc B. on August 05, 2023, 02:02:39 PM: Yup that 1.5uF cap is toast. You need to replace it before doing anything else.

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Title: Re: S.E.X. Completed hum Resolved but problems with C4S install
Post by: EnsgnofIndustry on August 05, 2023, 05:21:03 PM: That thought did cross my mind but I didnâ€™t notice it before I fired up the amp. Iâ€™ll send an email request.