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  1. #1
    Mentor jugglindan's Avatar
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    I probably need to start a different build diary for this, but I went shopping at The Green Shed (not the Big Green Shed) but a place in Canberra next to the landfill site that sells reclaimed stuff for next to nothing. I was looking for parts for the cigar-box mini amp that I am building for the foot stomp (or other things).

    For the princely sum of $5 I got this old Sanyo speaker:
    Click image for larger version. 

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    It's as ugly as anything I can imagine, but paint can fix that, and it's the right size and the 6" 5W speaker is usable. It likely won't give anything like a solid thump, but this mini amp might end up being used for a completely different purpose anyway.

    I also picked up the chassis of a Kustom Sienna 30W acoustic amp, again for $5:
    Click image for larger version. 

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    It looks like someone let the magic smoke out of a cap in the power supply section:
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    While I can replace the cap and fuse, I would be worried about why it blew in the first place and whether there are other faults. I don't have a chassis, and if I went to the trouble to build one, I would want to put a homebrew tube amp in, not this. So I might strip it for parts. I can salvage all the pots, the knobs, jacks etc. Most passive components are not worth enough to desolder, but there is a nice JRC13700 opamp sitting on an adapter board that is just ready to use in a pedal. There is also a spring reverb unit that looks OK. Too large for a pedal but I might be able to use it somewhere else, like in the mini amp.
    Last edited by jugglindan; 29-05-2020 at 12:24 PM.
    Mantra: No more pedals, must finish BlueyCaster...
    Disclaimer: I haven't done woodwork since high school, and wasn't really paying attention at the time ...

  2. #2
    Member Cliff Rogers's Avatar
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    Quote Originally Posted by jugglindan View Post



    It looks like someone let the magic smoke out of a cap in the power supply section:
    Click image for larger version. 

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    While I can replace the cap and fuse, I would be worried about why it blew in the first ......
    Read the story of the capacitor plague.
    https://en.m.wikipedia.org/wiki/Capacitor_plague
    Cliff

  3. #3
    Mentor jugglindan's Avatar
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    Quote Originally Posted by Cliff Rogers View Post
    Read the story of the capacitor plague.
    https://en.m.wikipedia.org/wiki/Capacitor_plague
    Thanks Cliff, that was an interesting read. I don't know when the amp was manufactured, but at least I now know it's possible for the cap to fail catastrophically all by itself, and there may not be anything else wrong. Fortunately I haven't started tearing down the amp for parts (I got distracted testing a chorus/vibrato pedal by playing shimmery ambient stuff), so attempting a fix is possible.

    DC
    Mantra: No more pedals, must finish BlueyCaster...
    Disclaimer: I haven't done woodwork since high school, and wasn't really paying attention at the time ...

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