Catalinbread - SFT  [traced]

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Re: Catalinbread - SFT

Postby deltafred » 19 Jun 2011, 21:58

mothercruncher wrote:Hmm, just got back from hols and had a good session with this tonight- did anyone have an issue with HUGE volume with the vero layout for this?

The volume pot is basically barely doing anything and, stock, it's (probably rightly) running so much louder than when in bypass :hmmm:


It sounds like you could have no ground connection to the volume pot, either a faulty pot or bad soldered joint ( but looking at you photos I would very much doubt a bad joint).

Really neat build, love it. I would also like to thank Mike for his vero layout and all the guys involved in tracing it.

I have built 3 so far and none have had volume issues, one was very unstable and gated but that turned out to be me missing a track cut. :roll:
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Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
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Re: Catalinbread - SFT

Postby ShortScaleMike » 20 Jun 2011, 09:10

mothercruncher wrote:Many thanks to Mike for the ver0 layout and rcubed and the original tracers who put the hard yards in. :applause:


No worries, beautiful build.
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Re: Catalinbread - SFT

Postby mothercruncher » 20 Jun 2011, 16:03

Argh, how embarrassing- I should have spotted that one- nothing was getting bled through to ground. That pot was the one component I recycled for the project too, that'll teach me.
Thanks for the spot DF :applause:
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Re: Catalinbread - SFT

Postby deltafred » 21 Jun 2011, 15:49

mothercruncher, glad to be of help.

If I have a problem with something electronic I usually phone a good friend of mine and talk through it. Usually it hits me as I am having to think it through to explain it to him (he is also a retired EE). When you have built something you usually imagine the worst.
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
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Re: Catalinbread - SFT

Postby neoflox » 31 Dec 2011, 18:39

Hi,
did anyone ever compared an original SFT with a cloned one? I did back when the first verified layouts came out and I remember it sounding significantly different. Less overall gain, shitty sound with lowered gain. If someone is certain to know a equally sounding layout, please tell which one it is ;)
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Re: Catalinbread - SFT

Postby DWBH » 12 May 2014, 21:37

Image

Here's one I built for my bassist friend of mine.
Regarding the weird connection on the pot, you're all talking about that connection between lug2 and the resistor to ground right? What's the catch? Should it be eliminated?

Haven't tried it with bass, only with guitar, and although I thought it would be more gainy, it's very amp-like, almost tweed-ish.
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Re: Catalinbread - SFT

Postby deltafred » 12 May 2014, 22:57

DWBH wrote:Here's one I built for my bassist friend of mine.
Regarding the weird connection on the pot, you're all talking about that connection between lug2 and the resistor to ground right? What's the catch? Should it be eliminated?

Haven't tried it with bass, only with guitar, and although I thought it would be more gainy, it's very amp-like, almost tweed-ish.

It's a while ago so I had to go look at the schematic to see what what was going on around the gain pot and realise that I have wired mine incorrectly and that was probably causing the high gain with the gain pot right down. I should think that if you wire it as the schematic (and not incorrectly as I did) then it should be fine.

I have used mine on both guitar and bass, I built it for bass but sounds nice with guitar.

It is supposed to sound like an Ampeg SVT bass amp, with a similar sound when you overdrive it. Having only ever played bass through an Ampeg rig once I cannot say how true this is. We were the support band and the Ampeg rig belonged to the headline band so I didn't want to mess with it. I just plugged in and it sounded ok as he had it set so played it like that.
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Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
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Re: Catalinbread - SFT

Postby Sonofthebeach » 04 May 2015, 10:15

I built this one yesterday and am not sure that it works right cause the pedal behaves not "normal" compared to other overdrives.

Only with gain maxed the pedal has a good sound. low gain settings let the overall volume drop. With low gain settings the volume has to be cranked but when I crank the gain the volume gets way too loud. But with the volume on half or below there is less gain...

I used a madbean faultline pcb. I already put a linear volume gain pot in....

When comparing to youtube demos I notice that the original units do not seem to have those problems.

Has anyone an idea whats going on?
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Re: Catalinbread - SFT

Postby greenskull » 11 May 2015, 01:53

Sorry to say I built the Faultline years ago and was disappointed I couldn't really match the demo of the real thing. Seemed like not enough gain from what I remember.
fuck smooth tone, fuck eric johnson - Seiche
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Re: Catalinbread - SFT

Postby Visualdistortion » 29 May 2016, 17:30

Someone share me the SFT REV 2 for the week, so I take pictures and get values of capacitors and pots, maybe it can help for helping debugging the previous tracing.

This is pictures: https://www.dropbox.com/sc/p76h70dy0ch3 ... G8ttR24Bxa

I can give you more information but you need to be really fast, because I will give back the pedal tomorrow.

Catalinbread SFT REV 2

Pots:
Treble & Bass : A1M
Vol: A250K
Gain: A1M

1N4001 protection diode

Q1-Q6: MPF 4393

CAPACITORS:

C1: 104K
C2: /
C3: 4n7
C4: 1uF
C5: 683K
C6: 151 1KV blue
C7: /
C8: 1uF
C9: 104K
C10: 102K
C11: 4n7K400
C12: 681K
C13: 472K
C14: .47 1KV blue
C15: 1uF Pol
C17: 2,2uF Pol
C18: 472K
C19: 472K
470uF
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

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arcaarca (06 Jun 2016, 16:32), Blend (29 May 2016, 22:05), deltafred (30 May 2016, 12:18), lohstah (31 May 2016, 21:32)
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Re: Catalinbread - SFT

Postby SonicRiff » 06 Jun 2016, 15:51

That's great. thanks ! The SFT Rev2 is awesome.
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Re: Catalinbread - SFT

Postby Blend » 06 Jun 2016, 16:08

Here is a schematic based on "Visualdistortion" pictures, concrete differences compared to the first version of the SFT removing 2 of the 8 original 2N5457, replaced with mpf 4393 and used here with variant mu-amp SRPP, adding gain boost, reshaped tone etc. Has anyone had a chance to compare the sound of both versions? I version is reliable with bass (top 18/24v), whose guitar. For those shown in the schematic (?) It was impossible to verify the value (R) and the connection (Q6 source resistance).

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Re: Catalinbread - SFT

Postby Visualdistortion » 06 Jun 2016, 21:43

I compared a clone of version I I did few years ago (apparently the tracing of the first version have some errors) with this one, I can really say that the version II it's really really better, awesome ampeg tone on a clean bass amp.

I can try to get again the pedal, and verify what you want with pictures, please tell me asap what you need to confirm.
I tried to label the resistors; but they are really close to the pcb.
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)
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Re: Catalinbread - SFT

Postby SonicRiff » 07 Jun 2016, 09:58

I have the V1 and had the opportunity to test V2.

The V2 is really awesome, much easier to use thanks to the switch and has a wider tonal range (like 2 amps in one pedal). Like the V1, SFT V2 works like a charm with my bass.
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Re: Catalinbread - SFT

Postby Blend » 07 Jun 2016, 13:58

hello, I'm sending you the pictures in which you can understand where I miss the connecting traces, i reloading the schematic for writing correction R17 is 1K8.
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Re: Catalinbread - SFT

Postby Blend » 07 Jun 2016, 14:18

If you can control tracks under Q1 and Q6 is perfect.
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Re: Catalinbread - SFT

Postby Visualdistortion » 12 Jun 2016, 08:51

On Q6, C14 go on the center pin S
On Q1, the 2 1M resistors are NOT connected to the D pin
R10 go directly to G pin of Q4. C5 is not connected to G PIN

I've added tons of pictures, tell me if you need something more. It's actually sunday 10am here, I can take the pedal with to monday 5PM.

https://www.dropbox.com/sc/p76h70dy0ch3 ... G8ttR24Bxa
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

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Blend (12 Jun 2016, 11:05)
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Re: Catalinbread - SFT

Postby Visualdistortion » 12 Jun 2016, 17:33

https://www.dropbox.com/s/tkz6y23cny55o ... 1.jpg?dl=0

On left of Q6: Brown black Red Gold so 1K
I don't have nothing to measure the blue cap it's writted
'47
1KV

and the " ' " it's clearly in front of number 47

ALSO:
- The + leg of C4 go on the the left point of C3.
- On Q1, the 2 1M resistors are NOT connected to the D pin
- R10 go directly to G pin of Q4. C5 is not connected to G PIN
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I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

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Blend (12 Jun 2016, 19:01), lohstah (14 Jun 2016, 09:11)
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Re: Catalinbread - SFT

Postby Blend » 12 Jun 2016, 19:13

It finally, thanks to Visualdistortion for the many pictures taken, C14 is 47pF and downhill from source Q6 the resistance value is 1K. In conjunction with the drafting of the schematic, I have tried to adopt some improvements on my clone of the first version of the SFT and it really worth for those who kept him in a drawer or as a doorstop or if you do not want to deal with the new building of the SFT II.
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Re: Catalinbread - SFT

Postby Visualdistortion » 12 Jun 2016, 20:37

Awesome! hope someone will do a pcb or a vero soon =D
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)
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