My mods of Boss CS-3 -- nice pedal now

Discussion in 'Burnt Fingers DIY Effects' started by RustySterling, Jun 20, 2019.

  1. RustySterling

    RustySterling Tele-Meister

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    Hi. I hang in Shock Brother mostly. Built a couple of amps, building another, but I got the bug to mod and build pedals. Got it cheap, about $30. Was noisy -- buzzy and hissy -- and just made everything else noisier. So I started with a Framel mod, all caps, resistors and diodes. Still a nice upgrade nonetheless and that did away with the buzz and some of the hiss.

    I started researching other mods and kits. Found lots of information and even considered Allums Opto Plus mod, involving some op amp swaps as part of the mod. But I figured I already had the equivalent of the Opto mod with the Fromel. Instead, I got some of Monte's SIP to DIP conversion boards and risers as well as raised sockets. These will give me some room to play. But I had read someone else swapping out the SIP JRC4558LD op amps with Burr Brown OPA2134PA and had great results. I had a couple on hand and now they reside in the CS-3. This will never be a studio pedal but the hiss is now diminished tremendously and this pedal sounds very transparent. For live play this will be wonderful, especially with slide.

    I'm not a noob with electronics. I've done a lot of searches here and learned a lot as I lurked. I just wanted to share what I had accomplished. I'll do pics later.
     
    Last edited: Jun 20, 2019
  2. awasson

    awasson Poster Extraordinaire Gold Supporter

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    Cool. The CS3 was what I was looking for before I built my optical compressor. I’ve used the OPA2134PA in several pedals in place of 4558’s and yes, they seem hifi and crystal clear. Nothing like a really transparent compressor or preamp to make the guitar more vibrant.
     
  3. zippofan

    zippofan Tele-Afflicted

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    I like the Burr-Brown chips and I bought a few different dual op-amps to try in my Prince of Tone. I liked the LF353 the best in that, though the OPA2134 and NE5532 both sounded better than the stock JRC4580 so I didn't try the 4558.

    My son has the CS-3, but doesn't use compression a lot. I'm still messing around with the Engineer's Thumb I built a couple months ago, I can't believe how adjustable it is for a guitar comp. Hmm, now I'm wondering how a pair of OPA2134's would sound in it vs the TL072's!
     
  4. RustySterling

    RustySterling Tele-Meister

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    I've also done some changes to my SD-1, which Robert Keeley himself modified a few years back. He stacked two 4558Ps, which I just recently change to a NE5532, which I like much better. I may try a OPA2134 at some point but I'm very happy with the 5532. Along with the CS3, the SD1 is my go too for slide. Sounds fat and toneful -- almost a George Throughgood sound. The CS3 is necessary for the sound, without it the slide with just the SD1 sounds good but not as thick as I'd like.
     
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