Sho booster problems

Frequent questions about dead or faulty pedals. Whether you repair, mod or build pedals, debugging is important. Threads about general debugging problems irrespective of the circuit involved...
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Mrdorbe
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Post by Mrdorbe »

Hey guys I hope I'm in the right thread...
I built the sho booster used a pic I found in the Internet worked like a charm!! Clean boost perfect
But when I tried to build another one it worked but the pot made scratch noises and the sound coming out was overdriven.
I used the same parts and did everything the same can anyone think of what I could do wrong the second time that could cause this problam?

By the way I tried replacing the pot and stil the same also checked it with multimeter..
Thanks

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Lucifer
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Post by Lucifer »

When pots scratch, it suggests DC where it shouldn't be.
Make sure one of the cap feeding the pot isn't shorted out by a sliver of solder or stray bit of copper track.
”Sex is great - but you can’t beat the real thing !” - The Wanker’s Handbook

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Nocentelli
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Post by Nocentelli »

Isn't the control labelled "crackle OK"? I'd be more curious about why your first build didn't crackle, and also why this second one is distorted: I think the circuit probably overdrives at really very high levels, but before then you will probably also be distorting whatever stage comes next in the chain. It is a fairly clean, glassy boost most of the way up.
brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?

davent
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Post by davent »

Sounds like something may have been wrong with the first one. Low settings a clean boost, high settings, kick the snot out of the first tube preamp stage, crunch. Crackle?- all's fine.

http://media.zvex.com/FLASH/SHO/

dave

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