Boss SD-1 mod for bass

[screaminglucy]

I just finished modding my Boss SD-1 to fulltone bass drive specs. I compared it to the real thing and i cannot tell them apart. Here are the components i changed in the SD-1 in case anyone else is interested in this...

R2 = 620k
C2 = 1uf
C3 = 0.068uf
D6 = jumper (short)
D5 = 1n4005
D4 = 1n914
R7 = 1k
put 47pf across clipping diodes
C4 = 0.22uf
C5 = 0.22uf
R8 = 220
remove C6
R9 = 1k
C8 = 0.1uf
R16 = 100
C10 = 10uf

Flat mids switch adds 47k in series with 0.01uF between pin 1 of the opamp and pin 1 of the overdrive pot (the lug connected to R5)
I also swapped the opamp for NJM4558D

 

[screaminglucy]

i also added a blend knob next to the dc jack...using this circuit
Invalid Link Removed

pics

and sound clips to come...

 

[bass-shy]

Cool! Thanks for sharing. I have an SD-1 lying around. I just might have to give this a shot.

 

[vigor&kandor]

is this fulltone with booster on? or off?


is R6 just 100 ohms?

 

[screaminglucy]

boost on....gain up to 9 o clock is like boost off. i didnt do the comp cut switch.

r16 is 100ohm

 

[conundrum]

What's a good place to buy these parts, a radio shack type store, or Digikey?

 

[screaminglucy]

smallbearelectronics is the easiest to find the right parts. otherwise radioshack, digikey, or mouser.

 

[skulletwhip]

I gotta ask what a jumper is. I just started building my own stuff and have seen that word a few times.

 

[dune2k]

Basically a piece of wire that makes a connection between two points.

 

[skulletwhip]

Thats what I thought, but it seemed TOO obvious. Thanks.

 

[conundrum]

edit: Maybe a Monte Allum mod would be less complicated for me to start off with.

 

[T.A.P Bass]

Bump

Waiting for the clips.

 

[audiomitch]

edit: Maybe a Monte Allum mod would be less complicated for me to start off with.

I just did the Monte Allums SD-1 mod, but I had guitar in mind. I'll have to try it on bass. Unfortunately, I never use fuzzy bass in real life, so I'll be a poor judge if it's any good or not.

 

[screaminglucy]

I'm now using a red llama for my overdrive. I find it retains more low end. It does sound more towards a fuzz sound though.

 

[markxander]

Still have that modded SD-1 hanging around? Shoot me a PM if you feel like selling it ha

 

[lavaxtris]

bump

wheres the sound clips?

 

[gregmon79]

If you were to compare your mod to onee of the monteallum mods, which would it be??

 

[screaminglucy]

what's a monteallum mod? got a link?

 

[stratovani]

what's a monteallum mod? got a link?

Here you go:

http://www.monteallums.com/

 

[gregmon79]

I'd really to know if your mod is anything like the stacked mod that monte Allum does. That's the one I got.