AMT Electronics - S1 Legend series  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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J0K3RX
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Post by J0K3RX »

andregarcia57 wrote:
J0K3RX wrote:
Pruttelherrie wrote:Hewheh came across this pic:

Image
yeah and I will take that Kemper sitting behind him!!! :twisted:


anyone have schematic or internal pictures AMT CHAMELEON CN-1???

+1 on that! The demo I heard on youtube didn't impress much me but maybe it was because of the guitar/amp sound...?


andregarcia57
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Post by andregarcia57 »

attached!
hughs
Andre
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AMT M1 Legend series 01.JPG
AMT M1 Legend series 02.JPG

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J0K3RX
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Post by J0K3RX »

This must be a fairly new version... looks a lot different than the older version

A504 = A500K
B103 = B10K
B104 = B100K
A504 = A500K
A104 = A100K

Here are some pics I found of the older version with brown pcb and lots of flux
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img-1337-ab743a0715.jpg
img-1336-151072b4fb.jpg

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The G
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Post by The G »

This one is for J0K3RX, because nobody would post samples :hug:: a video of an experiment started by this very thread. Although I cannot say it is an AMT clone anymore.
I started from the B1 schematic, but with 2SK117 JFETs. Because of too much gain I took out one FET stage. The tonestack is a scaled FMV - I tried some variations, but I don't like it. I made some experiments with the Hiwatt tonestack and the results are promising.
The cabsim is almost the same as here (last post on the page), the only differences being C1, C2 and C4. It's switched by a DPDT mini toggle.
It's working way better at 18V.
I am very please with the results as they are right now. Maybe there are too many treble-bleeds (on the guitar, on the chipamp volume control, and who know where else). The true-bypass idea was definitely not good without a PCB layout to match. And this is the sound of an chipamp into a Hi-Fi speaker, through a PC microphone, and then through YouTube. The real thing is much better. I am really impressed.
On the improvements list I have an input buffer (right now is true-bypass and it oscillates on higher settings of the TREBLE knob), some kind of input level adjustment (maybe a peak detector?) and a buffered Hiwatt tonestack. Maybe I'll keep two JFETs in it, though :mrgreen:.
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cabsim-amt_v3_sch.png

diflydream
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Post by diflydream »

Guys, first sorry for my bad english.
I was checking the excellent posts and liked the Tube Cake, but found some components in different schemas es_gt and KMG. They are:

In the scheme of es_gt, R5 and R8 are 220R, 240R are in zzz.
In the scheme of es_gt, R18 and R19 are 0.25R, the zzz 0.24R.
In the scheme of KMG, resistor R20 is-8R and has the C8 and C9.

Could you explain the differences? I would like to build one for me to play at night in bedroom, but not sure which to follow.

Thanks in advance!
Best regards!

diflydream
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Post by diflydream »

diflydream wrote:Guys, first sorry for my bad english.
I was checking the excellent posts and liked the Tube Cake, but found some components in different schemas es_gt and KMG. They are:

In the scheme of es_gt, R5 and R8 are 220R, in the KMG 240R.
In the scheme of es_gt, R18 and R19 are 0.25R, in the KMG 0.24R.
In the scheme of KMG, resistor R20 is-8R and has the C8 and C9.

Could you explain the differences? I would like to build one for me to play at night in bedroom, but not sure which to follow.

Thanks in advance!
Best regards!

armkon
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Post by armkon »

in KMG schematic 8R resistor R20 is a 8ohm cab...
KMG schematic is working one, it's simulated with psspice software and it work...
I have make a layout in another post, you can check it.

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Post by diflydream »

rcustoms wrote:ok my friends ,the last and final version ,fix s1-b1-r1 and f1(arkom version and lugburz 2000 diode mod)just replace components,in this case are S1 components ,use jumpers if necessary .my unit are working ok and contain some minor values changes.if somebody find something wrong please tell me to correct.
final jpg.jpg
all for one and one for all (Jok3rx)

Perfect! Great job!
Where do I find the layout of F1?
Thanks in advance!
Best Regards!

Rodrigo

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Post by diflydream »

armkon wrote:in KMG schematic 8R resistor R20 is a 8ohm cab...
KMG schematic is working one, it's simulated with psspice software and it work...
I have make a layout in another post, you can check it.
Thanks for the tips akron!

I will print and check the pcb.
Best regards!

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Post by okgb »

the cab sim box has 4 controls but the schematic only two ?
I'm interested in making a vero for it , tia regards Greg

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Post by Colitoreload »

Did anyone build the S1? with or without the cabsim

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Post by sodapep2 »

Geez you guys really get shit done! Nice work on all accounts, just went through the entire thread.

Did anyone get their hands on the F1/Fender emulator yet? The preamps sounds great direct (on the videos) and all the extras (FX loop, cab sim, etc) are icing on the cake.

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Post by Nicht Bernd »

sodapep2 wrote:Geez you guys really get shit done! Nice work on all accounts, just went through the entire thread.

Did anyone get their hands on the F1/Fender emulator yet? The preamps sounds great direct (on the videos) and all the extras (FX loop, cab sim, etc) are icing on the cake.
Have a look at page 13.

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J0K3RX
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Post by J0K3RX »

Nicht Bernd wrote:
sodapep2 wrote:Geez you guys really get shit done! Nice work on all accounts, just went through the entire thread.

Did anyone get their hands on the F1/Fender emulator yet? The preamps sounds great direct (on the videos) and all the extras (FX loop, cab sim, etc) are icing on the cake.
Have a look at page 13.
I see a Fender emulator but not the F1...?

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Post by Dr Bertson »

Hello!

I will build this AMT S1 Legend Series, I have looked at the schematic, but there is no value on the capacitor C19, the first capacitor that is connected between Q1 - source and ground in the first stage?. I have tried to figure this out by looking at other schematics to comparing, but it would be good if somebody can tell me with value this cap C19 has, or if somebody can take a picture of the original circuit board and post that here?

Thanks

BuryMeInSmoke
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Post by BuryMeInSmoke »

I've just received a Tube Cake 3W and P2 pedal.

Anyone interested in gut shots of either?...I think there was some talk about someone wanting to see the innards of the TC-1 or TC-3 a while back?

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Post by Ice-9 »

BuryMeInSmoke wrote:I've just received a Tube Cake 3W and P2 pedal.

Anyone interested in gut shots of either?...I think there was some talk about someone wanting to see the innards of the TC-1 or TC-3 a while back?
Yes we would love to see some gut shots of the P2 :thumbsup
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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The G
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Post by The G »

+1.

And we would love to see gut shots of the Tube Cake, too.

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Post by BuryMeInSmoke »

Sweet, will do it in a few hours, still at work, and had too much fun with the P2 last night to stop and take pics :P

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Post by BuryMeInSmoke »

Sorry y'all, pictures are a bit sloppy, will hunt out my tripod and take some better photos in better light tomorrow. I'll at least manually write out any component values and will start a proper thread for each too.

Here's what I've got so far if anyone wants a look:

P2 - https://www.dropbox.com/sh/64bky30w666agtw/JRAw9jmpQC
TC-3 - https://www.dropbox.com/sh/wm676vwji8zy47z/G8ABxWORWK

(Open image > right click > 'View Original' for high res)

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