Anybody know what happened to this topic?
http://www.diystompboxes.com/smfforum/index.php?topic=89399.0
Would like to continue... Anybody else?
Ok, found this. looks like they made a working layout. Also, if you go to page 1 there are sound samples of each one. It's all in Spanish but hey, that's what google translator is good for :icon_wink:
http://www.guitarristas.info/foros/muestras-sonido-messa-soldano-krank-engl-vht/88517/pagina2
What is up with those Mosfet stages??? ;)
Quote from: WGTP on May 09, 2012, 11:53:37 PM
What is up with those Mosfet stages??? ;)
Good question, but I am about to find out! :icon_rolleyes: What do you think? I value your opinion big time!
~Jim
I'm interested to hear what they sound like. Are they supposed to be more tublike? That seems to be the motive for most of the unusual Russian stuff. I'll try them if I can get the right resistor values. Did you see my post about Mu-Amps and diodes? ;)
that ruskie stuff is the nuts.... :icon_cool:
well worth a few breadboard sessions for sure!... :icon_twisted:
@wgtp: yeah i clocked that mu amp stuff...from what i remember reading it was best to have a source resistor/ cap in the end iirc...
Quote from: WGTP on May 10, 2012, 02:40:43 PM
I'm interested to hear what they sound like. Are they supposed to be more tublike? That seems to be the motive for most of the unusual Russian stuff. I'll try them if I can get the right resistor values. Did you see my post about Mu-Amps and diodes? ;)
Here are the sound clips..
http://www.guitarristas.info/foros/muestras-sonido-messa-soldano-krank-engl-vht/88517
Sound pretty damn good to me! I think I saw your post about Mu-Amps and diodes... but I didn't bookmark it :icon_frown: You can post it again if you wouldn't mind?
Rob: I am really into the sound of the AMT stuff as you know... I think these designs come from the same Russian forums where Victor K hangs out!?
I see you were pretty active in the original post and it looked like Brymus bailed at the end huh? This stuff is really the best sounding pedals I have heard to date! I built the B1 and I love that thing... sounds better than my retail P1 pedal!!
@jim:
yeah dunno what happened to brymus, ahhh so you built the B1, from that schematic?...cool...clips?.
that ruskie stuff is defo worth breading man, i must get round to it one day...arghhhh i need more breadboards. :D
EDIT: i like that ENGL3...nice.. i like em all, but that sounds a bit warmer.. :icon_twisted:
Rob - Yeah, I built the B1 and it worked first time I fired it up... changed a few values in the tone stack and now it is my main pedal/preamp... So many tweaks you can do to these things and they all seem very similar! Still no luck with the cab simulation but all of the of the pedal schematics seem to work good! That damn cab sim is pissin me off! :icon_evil:
I will try to record a couple sound clips tonight.. won't be anything special just my 7 string and me chuggin/palm mute and maybe a couple leads... B1 sounds REALLY heavy!! :icon_twisted:
cool, look forward to em.. :icon_twisted:
yeah dunno why the cab sim part isn't having it!...especially as the rest is ok...weird!..
i'm still pondering on that sim lark!.. ::)
Here is the B1 schematic I used... I used J201's for all because that is all I had, but works great so..? Simple build as compared to the S1 or the P1.
(http://dl.dropbox.com/u/11178619/V3%20small.png)
Edit: I used 20k trimmers for the 3 drain resistors - the two 8k and one 10.5k.... not sure what they read because I adjusted them by ear.
cool, yeah best off using trims imo....nice easy build!.. :icon_cool:
hows the tonestack seem?...
Quote from: deadastronaut on May 10, 2012, 08:14:31 PM
cool, yeah best off using trims imo....nice easy build!.. :icon_cool:
hows the tonestack seem?...
was a little bass heavy but VERY wide range on the treb and mids... the treb-mid-bass seem to interact with each other. I tried 33k resistor and a 220pF for the treble with two 22n for the bass and mid... sounds good also!! Tone stack is great on this pedal anyway... Seems like all of the AMT pedals have about the same tone stack.
Rob... have you seen this version of the BSIAB X2? Probably have just checking :icon_wink:
(http://dl.dropbox.com/u/11178619/bsiab_x2.gif)
yep, thats what the spitfire was based on......wgtp and walt put me onto that!... ;)...those ruskies know there stuff when it comes to distortion!.. :icon_twisted:
just been listening to B1 clips/vids, i'll have to give this one a go i think!!..nice!. :icon_twisted:
those diodes look mad.... :)
Yeah, I wasn't a real big Bogner/Hafler nut but this B1 is killer! The videos don't do it justice!
By the way, I found this which is leading me to believe that there may be a misread part in the cab sim on the legend pedals? I could be wrong though...
(http://dl.dropbox.com/u/11178619/article_03_shema.GIF)
Here's another one..
(http://dl.dropbox.com/u/11178619/06_MagnumLite.GIF)
they look interesting....especially the switchable version... :icon_cool:
btw just made a layout for the AMT B1... ;) for when i eventually get round to it... ::)
(http://dl.dropbox.com/u/7464107/amtb1.jpg)
if anyone wants the pdf's/pcb/layout to try/verify it, i'll post em up ok.....checked all looks ok. ;)
Damn man, you don't F around!
gimmie and I will try it... :icon_mrgreen: I have all the parts 10 times over!
;D okey dokey...hold on i'll post em... ;)
btw that top ss has a voltage divider (4.5v's)....the bottom one doesn't!....hmmmm....
here ya go!..
http://dl.dropbox.com/u/7464107/AMTB1%20LAYOUT.pdf
http://dl.dropbox.com/u/7464107/AMTB1PCB.pdf
have fun.....i'm off to bed!....c ya later!.. ;)
as a note:
i was reading that the B1 should be used through a send return, correct?...so it uses the power amp only i guess, and not the amps pre-amp/eq!...
makes sense to me.. i only use a clean channel of my marshall anyway...but i'd be interested to try that!...just for kicks.. :icon_twisted:
have you tred yours that way?
The speaker sim appears to use N and P channel Jfets??? ;)
Quote from: deadastronaut on May 11, 2012, 10:20:40 AM
as a note:
i was reading that the B1 should be used through a send return, correct?...so it uses the power amp only i guess, and not the amps pre-amp/eq!...
makes sense to me.. i only use a clean channel of my marshall anyway...but i'd be interested to try that!...just for kicks.. :icon_twisted:
have you tred yours that way?
Yeah, I have tried it straight into the fx return on a 5150 combo and I also have an old B.K. Butler - MosValve poweramp. Sounds killer on both. I have also tried it through the input of a small practice amp and sound pretty good but not as good as straight into a power amp... I think they say not to use it into the input jack of an amp because you would be coloring the true tone from the preamp pedal.. For best results should be used as a preamp rather than a distortion pedal... I run it mostly direct using cab impulses, to me that sounds the best! You know the Spitfire sounds killer as a preamp as well!? The new Legend 2 pedals have 3 outputs "CAB SIM-PREAMP-DRIVE" so, you can run them into the front of your amp using the Drive output.
May have something to do with the final stage which was left off the schematic that I posted earlier. This is the full schematic of the B1 minus the cab sim..
(http://dl.dropbox.com/u/11178619/AMT%20B1%20Schematic.png)
Not sure why it was left off of the final schematic but I am sure it would work also.
Quote from: WGTP on May 11, 2012, 02:46:56 PM
The speaker sim appears to use N and P channel Jfets??? ;)
That's what I am thinking... On all of the AMT Legend schematics they have all three listed as 2SK208R's which I believe can be substituted with J201's. I think one or more may not be 2SK208R's?
This is the cab sim from the P1 schematic.. they are all the same on all of the Legend pedals.
(http://dl.dropbox.com/u/11178619/CAB%20SIM.jpg)
ok here is a real crap sound clip of the B1... A little too much lows, maybe a going in the red/clipping a little and my playing is........CRAP!!! I just sat down and played the first thing that came outa my fingers, sorry :icon_redface: But you can get an idea of the tone. I am still messing with the tone stack, not completely happy with it but I love the pedal!!!
http://dl.dropbox.com/u/11178619/B1%20TEST22.mp3
Jok3rx the first schematic posted have different values(resistors/caps) compared to the final schematic.Should it make big difference in sound?
Quote from: fretzburner on May 12, 2012, 07:27:37 PM
Jok3rx the first schematic posted have different values(resistors/caps) compared to the final schematic.Should it make big difference in sound?
Well those are not my schematics.. Another guy in another forum posted them and they were a progression of what he thought sounded best to his ears. Actually, the first schematic was the latest one, the other was the direct exact schematic from the traced out B1 pedal so it would be the most accurate but since the J201's are being used in place of the 2SK208R's it won't really work right. I have have tried them all and they really don't sound any different as far as I can tell. The main thing is the trim pot for the 12k resistors coming of the drain of the JFET's. Since the AMT pedals use different JFET's the J201's are the closest match but not quite the same spec so the resistors (trim pots) have to be set by measuring the voltages or by ear like I did. After you get it set the way you like it you can measure the resistance of the pot and replace it with a regular 1/4w resistor. So to answer your question, no they really sound pretty much the same but like I said you have to use trim pots for the drain resistor... hope that makes sense?
You might want to try deadastronaut's layout... it looks good to me!
Thanks Jok3rx your answer is very helpful and Deadastronaut's layout is already in my DIY creator planning to add that last transistor after the volume control.Don't really know exactly what this last stage for,just want to try.Maybe for direct to PA or the other way direct to amp front end?
Deadastronaut's layout correction 47nf to MID should be after 24k from Q4 not from Q4.
oops!. :)
JOKERX I love that clip. pedal sounds good. playing sounds good too. Been trying to understand solid state stuff more these days. May have to build this! Thanks for sharing!
Here's a layout I did... let me know if you see anything wrong with it? I am not good at making board layouts so let me have it! :icon_lol:
There are some extra pads for whatever reasons... some extra pads for optional diode configuration and a secondary output that bypasses the last stage like in the other schematic where the last stage is missing. Extra pads under the trim pots for different kinds of trim pots etc...
(http://dl.dropbox.com/u/11178619/B1%20Clone.jpg)
Here is the board transfer.
http://dl.dropbox.com/u/11178619/B1%20Transfer.png
I went by this schematic
http://dl.dropbox.com/u/11178619/AMT%20B1%20Schematic.png
Jok3rx, R3 is supposed to be 330ohms as per final schematic.
Quote from: fretzburner on May 13, 2012, 08:10:03 PM
Jok3rx, R3 is supposed to be 330ohms as per final schematic.
Ah, good one! That's what copy and paste gets me... :icon_wink:
Changed it, thanks!
Here's the new layout. Looks pretty much like the last layout but I have made numerous corrections and is now verified!
I will upload the new board transfer if anybody wants it.
Sounds amazingly good!
http://dl.dropbox.com/u/11178619/B1%20v2.PNG
DON'T USE THE OLD LAYOUT.
@jim, cool, sounds well mean.. :icon_twisted:., can you do a clip standard tuning though!...just want to get an idea of the riffin in standard E...cheers bud!.
hows ya tonestack coming on that?
you need to add pads for r13/r14/switch.. ;)
have you dabbled with the cab sim yet?....that looks interesting, especially the 'T' wah type section, i'd be interested to see what a 10k/20k pot on that instead of the 6.2k would do...hmmmm...
may need trimmers on that too..
@fretzburner: isn't that last fet for lifting the level back up after the tone stack / buffer ?....thats what i thought...i could be wrong though, as i am often.. ;D
Created new post called "AMT B1 - S1 clone"