Boss - DS-1 Distortion mods (what works, what doesn't?)

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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby chuckusa » 27 Apr 2018, 04:47

dv8r601 wrote:
chuckusa wrote:Quick question, How can I get the volume to come back up a bit after modding with w few ge 1n34a's and after performing the AMZ fat mod? Which resistor and what values?

^^^^Just a tip, That sounds kinda DEMANDING^^^^
BUT since I'm such a nice guy, I'll bite.
First off Lets find out which ones you've installed, where they came from, what they look like, And if you can operate a DMM,the Vf(diode setting) of said diodes
I ask bc I have a few legit Motorola 1n34 and they hover around 325-380 mV, I have a few batches of those eBay chinese "1n34a" that are really Si schottky and they are nearly half that of the real ones at 200-275 mV.
now to solve:

Normally that's the cost of using Ge diodes, the Vf is really low(>375mV) so unless you can fix that, your gonna cut way more of the volume.
many ways to go about this, 1) double up ge diodes by adding another in the same direction behind each one, thus lifting the Vf and still retaining the softer knee they yield. 2) piggy back them with a diode that has a higher Vf Like 1n4001, 1n4148, etc 3) carefully go thru this thread bc I'm pretty sure its in here. Its better to read everything and I'm 100% you'll get the answer your looking for, this place has Thousands of highly knowledgeable members that are nice enough to share.


Thanks so much for taking the time to share this info. I will get back to you soon!
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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby 5thumbs » 13 Jun 2018, 05:48

I wrote that original document as therapy... to the church-youth-kids I did sound for. I was inspired by R.G. Keen.

I've been dark for nearly a decade, mostly due to sickness. I just today showed it to a fellow guitar-playing friend. But I am enthused in the fact that these mods still stand up well. :-)

I still play old guitar-rock through these pedals... I keep an example of each on my pedal-board. I've had many tube-amps through the years, but I've downsized to a Vox tonelab se (the old one) and a few tube amps.

The DS-1 isn't that complicated, much like the tube-screamer. Just read, mod, and listen and you can do similar. :-)
Modding a DS-1? Please read 'Build Your Own DS-1 Distortion'.

"Other than a good first-in-line buffer/booster, using other FX to improve bad clean tone is like gift-wrapping garbage."
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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby Vinz35 » 09 Feb 2019, 22:30

Hi everyone,

I wanted to buy a Boss DS1 as a first "modding project" so I bought a used DS1, a MIT version around 25€.
I never played a DS1 before and I thought the stock version sounded quite nice. Still I bought the components to do the Keeley version.
I started to remove C2, C3, C1, C8, C12 and C14... then I realised my circuit board was a 1991 MIT with the TA7136 op amp, very similar to the MIJ version.

(like this one on the right Image, source: stompboxzone)

So I stopped everything.

What would you do ? Would you put the old components back in place ?
Can I still replace C1, C3, C5, C12 with 0.1Uf Caps (I bought MKTs) and is there any interest to do so if I don't do the rest of the mod ? and C2 and C8 with 1uF caps ? (even if C8 is already a 1uF cap in the MIJ version as written in Brett's document, which is excellent by the way).

I'm a bit lost.

Thanks in advance.

Vincent
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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby Renegadrian » 09 Feb 2019, 23:29

Mod the sh*t out of it. Dont forget to mod the tone section.
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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby Vinz35 » 10 Feb 2019, 10:11

Do you know if there is any modification to do to the keeley mod to adapt it to the pre 1994 version ?
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Re: Boss - DS-1 Distortion mods (what works, what doesn't?)

Postby Renegadrian » 10 Feb 2019, 11:31

Vinz35 wrote:Do you know if there is any modification to do to the keeley mod to adapt it to the pre 1994 version ?

No afair.
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