Went to modify my tube screamer and now I'm not getting a signal any ideas

[Belanger]

Seems like I'm continually messing up my projects, however total newbie so I can't expect myself to be great. Gives me a chance to learn trouble shooting skills.  I've sat one this for a few days now trying to figure it out on my own before asking you guys but I could really use some suggestions right now that don't include me giving up and walking away lol. Any help is greatly appreciated as always, thanks guys

What I've changed    51pf cap so a 51pf silver mica, 100uf cap upgraded to a Panasonic
47-10uf caps were changed to Nichicon audio caps , metal film caps replacing all NF value caps( I used 473j100 caps to replace those yellow green ones that are around all of those ceramic caps.  Asymmetrical clipping where I added a bat41 in series with existing diode   I had originally tried to swap the transistor in the bottom right hand corner for a mpsa18 and after I was having troubles swapped it back to the original     Also I had used a Nichicon BP 10uf muse cap first but swapped it to a polarized cap when I saw it wasn't working    That's all that's been done to it   Oh and a 1m pot but I was using it for awhile after putting in the pot before I did the other mods and everything was working fine.

[R.G.]

It's almost certainly one of the Big Three: wrong part pinout, wiring breakage or disconnection, or soldering problems.

If I were you, I'd go read "Debugging thread: what to do when it doesn't work" and follow the instructions.

[Cozybuilder]

+1 what RG said, plus it might help to read "The Technology of the Tube Screamer" by RG

http://www.geofex.com/article_folders/tstech/tsxtech.htm

[PRR]

> What I've changed .... cap cap caps caps caps bat41 transistor cap pot .... That's all

ONLY change ONE thing at a time!!

(Until you are utterly over-confident in your soldering and debugging skills, or just enjoy disappointment.)

The process has been described SO often that R.G. carved it in stone to save his sore fingers. If you made one/two changes, we might focus on that stage (read "Technology"); but with 9+ changes ALL over the board, you gotta go through the whole process (read "Debugging").

[vigilante397]

ONLY change ONE thing at a time!!

+1 to that. Learned that one the hard way

[Transmogrifox]

Does it work in bypass?  That may be a clue where to look.

Posting some DC voltage readings from around the circuit would help us help you. 

If I were you, I'd go read "Debugging thread: what to do when it doesn't work" and follow the instructions.

Now if only it worked the other way around at the same time.  If RG was you....and you were RG...

Well, RG would be in a lot of trouble but you would be in a good place right now ...

[robthequiet]

Have you checked the voltages on the 4558?

[Brisance]

why would you change caps to caps of the same value unless they were defective?

[R.G.]

why would you change caps to caps of the same value unless they were defective?

Probably because on the internet, it's common knowledge that the more expensive and difficult to find that a component is, the more magically better it will make sound through it. 

I'm not aware of any capacitors made from platinum/osmium foil with solid-hydrogen insulating layers, but I bet they'd be hugely popular with the hifi tweako crowd crowd if they existed.     Probably capacitors made from gold-pressed latinum would be even better.

Modding pedals is a huge draw to people who can't (perhaps yet) understand how to build pedals by the numbers, or more demandingly, design circuits from scratch. It's a way to participate, to be part of the pedal making explosion of the last 20 years without having the training or packground (perhaps yet). And raw tinkering is a valid way to get started. I did this before I had any formal training, back when soldering was done with sticks and stone axes.

I whimsically named this urge "BUMS" - Blind Urge to Mod Syndrome - but it's not entirely bad or silly. It does offer an entre to electronics that would not otherwise be available to people without the background to do more. And some of these people do go on to learn about electronics and train themselves higher in the art.

But the untrained modders need to understand that they're set up for the problem of the Sorcerer's Apprentice, knowing just enough to get themselves into trouble. I chuckle at some of the things I remember myself doing. I once spent a day at a library finding out that the band on a solid state diode is how the cathode is marked. It was much harder to find information back in the 1960s.   

[Belanger]

I just built A vero Andy Timmons overdrive as my first pedal which I think gave me a false sense of security lol.ill figure it out and it'll be another learning experience at least.

Also to who ever asked no there's no signal in bypass.
Most of the capacitors I changed were to metal film because there better quality.  Disagree if you want lol, it's just how I see it. I'd personally prefer to use wima caps or similar for my nf value components and silver mica for Some Of my pf  values.  Half the fun is experimenting isn't it?

Also I didn't keep all the caps the same value the input cap was bumped up and basically just wanted to see what improvements if any it would make. I'll check out the opamp as suggested as well

Have you checked the voltages on the 4558?

why would you change caps to caps of the same value unless they were defective?

Probably because on the internet, it's common knowledge that the more expensive and difficult to find that a component is, the more magically better it will make sound through it. 

I'm not aware of any capacitors made from platinum/osmium foil with solid-hydrogen insulating layers, but I bet they'd be hugely popular with the hifi tweako crowd crowd if they existed.     Probably capacitors made from gold-pressed latinum would be even better.

Modding pedals is a huge draw to people who can't (perhaps yet) understand how to build pedals by the numbers, or more demandingly, design circuits from scratch. It's a way to participate, to be part of the pedal making explosion of the last 20 years without having the training or packground (perhaps yet). And raw tinkering is a valid way to get started. I did this before I had any formal training, back when soldering was done with sticks and stone axes.

I whimsically named this urge "BUMS" - Blind Urge to Mod Syndrome - but it's not entirely bad or silly. It does offer an entre to electronics that would not otherwise be available to people without the background to do more. And some of these people do go on to learn about electronics and train themselves higher in the art.

But the untrained modders need to understand that they're set up for the problem of the Sorcerer's Apprentice, knowing just enough to get themselves into trouble. I chuckle at some of the things I remember myself doing. I once spent a day at a library finding out that the band on a solid state diode is how the cathode is marked. It was much harder to find information back in the 1960s.   

> What I've changed .... cap cap caps caps caps bat41 transistor cap pot .... That's all

ONLY change ONE thing at a time!!

(Until you are utterly over-confident in your soldering and debugging skills, or just enjoy disappointment.)

The process has been described SO often that R.G. carved it in stone to save his sore fingers. If you made one/two changes, we might focus on that stage (read "Technology"); but with 9+ changes ALL over the board, you gotta go through the whole process (read "Debugging").

[Belanger]

I'll also go step by step next time to.  Makes a lot more sense and will save me a lot of headaches
Thanks for the suggestion