'70 Fulltone help

[PMcG No.6]

There's something strange around the trim on your vero vs the schem...Is'nt it?

Sorry. I have a few forums I'm going back and forth on and thought I linked the schematic for the new layout here already. I used the GGG schematic for my layout: http://i47.photobucket.com/albums/f155/Leavittno6/Vero/GGGFuzzFace70.jpg  Is the trim wrong?

[The French connection]

Not accordingly to that last schem. But C2 looks oriented wrong...on one of those schem to say the least  . Your Output is coming from the lug2 of the volume pot? So the snapshot in your first post are not valid anymore, correct? OK!

[PMcG No.6]

Not accordingly to that last schem. But C2 looks oriented wrong...on one of those schem to say the least  . Your Output is coming from the lug2 of the volume pot? So the snapshot in your first post are not valid anymore, correct? OK!

Yeah. I already corrected C2 on the layout. I just need to update my photobucket. No, the pics at the beginning of this thread was using torchy's vero. I should post some updated pics, huh?

Not the best pics, but here are the updated ones:


The second white wire from the output tip is a clipped wire that was attached to the 3PDT.

[kurtlives]

The mid pot wiring is wrong. Lug 1 should go to 9V+.

Also the bypass cap on Q2 is orientated wrong on the schem.

[PMcG No.6]

The mid pot wiring is wrong. Lug 1 should go to 9V+.

Right now Mid-1 is connected to 9v via R9. Should I move it then so it connects directly to 9v? Like this:

Also the bypass cap on Q2 is orientated wrong on the schem.

Are you referring to C5 or C2? I've already changed C2 so that the - lead is going to ground. The schematic shows + going to ground. C5 is non-polarized, so I don't see how that could be oriented wrong. Sorry if I seem naive, but I'm trying and I appreciate the help. As frustrating as it is for some of you, I'm sure.

[The French connection]

As frustrating as it is for some of you, I'm sure.

No frustration at all! Troubleshooting is fun...when it has its happy ending! So you have no sound at all? Have you audio-probed your circuit already?
Do it, get you multimeter out and follow this debugging procedure:

http://www.geofex.com/fxdebug/newfx.htm

Make sure you have no short under your pots and come back with your measurement.

This thing gonna work!

Dan

[kurtlives]

Dude you got so many damn layouts and schems going on. It's so confusing.

Your posting a layout I havent seen.

Post two links. One to your current layout and schem.

[PMcG No.6]

Dude you got so many damn layouts and schems going on. It's so confusing.

Your posting a layout I havent seen.

Post two links. One to your current layout and schem.

Sorry for the confusion.

Here is the schematic: http://i47.photobucket.com/albums/f155/Leavittno6/Vero/GGGFuzzFace70.jpg

Here is the layout: http://i47.photobucket.com/albums/f155/Leavittno6/Vero/ZiggyStarfuzz70-1.jpg

Both links been posted here already. I posted a link to the new layout in my update yesterday. Don't mean to sound like an ass, but it seemed there was a little 'tude in your reply. I'm just trying to get some help. 

[PMcG No.6]

As frustrating as it is for some of you, I'm sure.

No frustration at all! Troubleshooting is fun...when it has its happy ending! So you have no sound at all? Have you audio-probed your circuit already?
Do it, get you multimeter out and follow this debugging procedure:

http://www.geofex.com/fxdebug/newfx.htm

Make sure you have no short under your pots and come back with your measurement.

This thing gonna work!

Dan

Thanks for the help, Dan. I'll check this out and see what I get.

[kurtlives]

Dude you got so many damn layouts and schems going on. It's so confusing.

Your posting a layout I havent seen.

Post two links. One to your current layout and schem.

Sorry for the confusion.

Here is the schematic: http://i47.photobucket.com/albums/f155/Leavittno6/Vero/GGGFuzzFace70.jpg

Here is the layout: http://i47.photobucket.com/albums/f155/Leavittno6/Vero/ZiggyStarfuzz70-1.jpg

Both links been posted here already. I posted a link to the new layout in my update yesterday. Don't mean to sound like an ass, but it seemed there was a little 'tude in your reply. I'm just trying to get some help.  

Ya there was attitude. But I'm trying to help you here as I have you watched try to get this fuzz working for a couple of weeks.

It's just easier if I know what schem/layout your using.


Referencing that layout/schem...You mid pot is wired wrong like I mentioned before. Not sure what that little layout snip it you posted before was. It doesn't look like it came from your current layout.

EDIT: I understand what your saying now. Ok move Mid 2 to 9V+ as well. That should do it.

[PMcG No.6]

Referencing that layout/schem...You mid pot is wired wrong like I mentioned before. Not sure what that little layout snip it you posted before was. It doesn't look like it came from your current layout.

EDIT: I understand what your saying now. Ok move Mid 2 to 9V+ as well. That should do it.

I have a jumper for mid-2 to connect to 9v already. On the layout it goes from 5a to 5b. Should I still move Mid-2?

[kurtlives]

Looks like both mid 1 and 2 need to be connected to 9V. The 1K resistor should be in parallel to lugs 1 and 2.

Lug 2 goes to the 33K/220R node. 9V also connects to that node.

[Brainbender]

I was thinking about putting a potentiometer instead of internal 5k trimpot in my '70 clone from GGG, but i'm not sure is it possible and if it is, what kind of potentiometer should i mount? 5k rev.log, log or linear? 

Thanks!

[liquids]

Once you get it up and making sound...

I can't speak for the GGG PCB and if it is accurate to the schematic, but when I look at this schem:

http://www.generalguitargadgets.com/pdf/ggg_ff5_sc_b70.pdf

To my eyes it looks like there is a 'jumper' right across the 1k and the mid pot from the DC jack, rendering both components useless in affecting the bias.

I believe torchys layout reflects this schematic, if I'm not mistaken (I'm not looking at it right now, admittedly), so if the schem is wrong in that way, the layout would be too...lots of people say even when they get this layout it working, their mid pot is basically useless...

But again, I may be missing something.

[PMcG No.6]

...lots of people say even when they get this layout it working, their mid pot is basically useless...

But again, I may be missing something.

That seems to be what I found also. Even after I got this working The mid pot was useless. I don't think the schem. is accurate.

[fuzzo]

Actually, the mids pot acts more like a volume, it increases the output volume (When I make a fuzz style circuit, I always put a resistor close to 1K for that reason). it gives impression to play on mids (but it doesn't).

I was thinking about putting a potentiometer instead of internal 5k trimpot in my '70 clone from GGG, but i'm not sure is it possible and if it is, what kind of potentiometer should i mount? 5k rev.log, log or linear?

That could be a great substitue of that knob, put a 4K7 + 5K (linear or Log ) on collector of the second transistor, brings some real cool addition, set low it creates a kind of buzzy fuzz .

[Brainbender]

Once you get it up and making sound...

I can't speak for the GGG PCB and if it is accurate to the schematic

lots of people say even when they get this layout it working, their mid pot is basically useless...

I've made a '69 model on this layout (it's common to all GGG Fuzz Faces) and the layout is correct. The trimpot on it worked properly, but i'm not sure for '70, because i still didn't soldered it. On original Fulltone '70, which i own, the trimpot is working as it should, so i was thinking about going a step further and replace a trimpot with potentiometer. Regarding to mids pot, on original it's preety useless. Just like Fuzzo said, "the mids pot acts more like a volume, it increases the output volume". It's true, but you hear a little difference in sound, but not much as you'd expect.

Actually, the mids pot acts more like a volume, it increases the output volume (When I make a fuzz style circuit, I always put a resistor close to 1K for that reason). it gives impression to play on mids (but it doesn't).

That could be a great substitue of that knob, put a 4K7 + 5K (linear or Log ) on collector of the second transistor, brings some real cool addition, set low it creates a kind of buzzy fuzz .

Thanks, man! A LOT!!!
If it works, i think my Fulltone will go on sale!


BTW, folks! Do you think Fulltone '70 will make some juicy prices regarding to end of it's production?

[Brainbender]

Once you get it up and making sound...

I can't speak for the GGG PCB and if it is accurate to the schematic

lots of people say even when they get this layout it working, their mid pot is basically useless...

I've made a '69 model on this layout (it's common to all GGG Fuzz Faces) and the layout is correct. The trimpot on it worked properly, but i'm not sure for '70, because i still didn't soldered it. On original Fulltone '70, which i own, the trimpot is working as it should, so i was thinking about going a step further and replace a trimpot with potentiometer. Regarding to mids pot, on original it's preety useless. Just like Fuzzo said, "the mids pot acts more like a volume, it increases the output volume". It's true, but you hear a little difference in sound, but not much as you'd expect.

Actually, the mids pot acts more like a volume, it increases the output volume (When I make a fuzz style circuit, I always put a resistor close to 1K for that reason). it gives impression to play on mids (but it doesn't).

That could be a great substitue of that knob, put a 4K7 + 5K (linear or Log ) on collector of the second transistor, brings some real cool addition, set low it creates a kind of buzzy fuzz .

Thanks, man! A LOT!!!
If it works, i think my Fulltone will go on sale!


BTW, folks! Do you think Fulltone '70 will make some juicy prices regarding to end of it's production?

[fuzzo]

BTW, folks! Do you think Fulltone '70 will make some juicy prices regarding to end of it's production?

Not sure about that , there's any "mojo" inside , no germanium, no tropical fish so any good things  .

For the "buzz" control, take a look at the peppermint from Analogman, the pot. at middle creates that sound. Nothing magic , it's just play with the bias of Q2 . I really like what sounds it gives, remind me some "nebula" tone on their last record .

I built a 70's fuzz and I was really desapointed . So I removed  some parts of the PCB and made a variation of  fuzz face.

[Brainbender]

I built a 70's fuzz and I was really desapointed . So I removed  some parts of the PCB and made a variation of  fuzz face.

You've built a GGG '70 fuzz or...?