SWEET REVENGE High Gain Preamp - Based on the Soldano Avenger

[J0K3RX]

Here's another -  have fun!



Larger image - easier to see
http://dl.dropbox.com/u/11178619/Sweet%20Revenge.png

Board transfer
http://dl.dropbox.com/u/11178619/Sweat%20Revenge%20Transfer.pdf

Schematic - Minus the presence pot but you can figure that out...
http://dl.dropbox.com/u/11178619/Soldano_Avenger_FET_Preamp.JPG

[Kesh]

the schematic is not the same as the board

[tyzjames]

awesome.. so which one is worth building first? the black forest or the sweet revenge?

[defaced]

Given the very close similarities between the old Dual Rectos and the SLO (the Avenger is just the OD channel of the SLO), I suspect this will sound alot like a Dr. Boogie. 

[pakrat]

Damn you J0K3RX, now I have to build this too....

[WGTP]

Nice stuff.  What affect do the diodes have?   

[J0K3RX]

Update: R15 changed to 10k   -   R10 and R11 change to 4.7k and 10k.

You can try different values for R10 and R11 until you are satisfied.. maybe socket them.

[J0K3RX]

Nice stuff.  What affect do the diodes have?  

I stole the idea from the Russians I am a double agent for the KGB and the CIA...

Seriously though... Read this, go down to the part about "Pseudo-triode" FET limitation

http://www.amtelectronics.com/support/articles/why_tube-like_cannot_measure_up_to_tube_inside/

WGTP - Glad to have you looking at this.. I was hoping you and Rob would comment and throw in your ideas!! You guys really know yer stuff!
Also check out this one:  http://www.diystompboxes.com/smfforum/index.php?topic=98954.0

[J0K3RX]

BTW - Is there a bug in diylc? I can't get the transparency turned off on most of the caps... makes it hard to read! ver 3.15

[artifus]

BTW - Is there a bug in diylc? I can't get the transparency turned off on most of the caps... makes it hard to read! ver 3.15

http://www.diystompboxes.com/smfforum/index.php?topic=44838.1900

[deadastronaut]

I was hoping you and Rob would comment and throw in your ideas!! You guys really know yer stuff!

wgtp has forgotten more than i'll ever know...


cool work jim!.. another beast is born.

[WGTP]

Well that's silly.  I understand a few things, but the Russian stuff with the extra Jfets and diodes is beyound me.  I think the diodes are to prevent "Hard" clipping from the Jfets, sort of like ROG's latest stuff.  The 1uf bypass caps are faily small, so they are creating a treble boost thru the circuit.  Same with the 1Meg/1n filter.  That is the way I usually tune my stuff for best tone.  For a fatter tone and more distortion, might try 2.2uf or 4.7uf electros.

After reading the article you posted, it looks like they are using Germanium or Shotkey diodes.  Might try those.

I've had to go back to work, so don't have as much time as I used to.  

[JebemMajke]

Can you post schematic please? Or AMT schem's, if you have any.

[J0K3RX]

Can you post schematic please? Or AMT schem's, if you have any.

This isn't an AMT design... Schematic is linked on the first post

http://dl.dropbox.com/u/11178619/Soldano_Avenger_FET_Preamp.JPG

[J0K3RX]

Well that's silly.  I understand a few things, but the Russian stuff with the extra Jfets and diodes is beyound me.  I think the diodes are to prevent "Hard" clipping from the Jfets, sort of like ROG's latest stuff.  The 1uf bypass caps are faily small, so they are creating a treble boost thru the circuit.  Same with the 1Meg/1n filter.  That is the way I usually tune my stuff for best tone.  For a fatter tone and more distortion, might try 2.2uf or 4.7uf electros.

After reading the article you posted, it looks like they are using Germanium or Shotkey diodes.  Might try those.

I've had to go back to work, so don't have as much time as I used to.  

Thanks for the input! I will give that a try with the caps... I read/translated some stuff in a Russian forum where Victor K said it was ok to use the 1N4148's so I have been using them since they are like everywhere here... I have a bag of BAT54's smd and I sometimes use them also on the back side of the boards... I don't hear a real difference between the two but I do hear a difference with them on there.. sounds more even and smooth, takes some of the harshness out of it is the best way I can describe it..? Maybe it's the power of suggestion, I don't know?

Rob - Stop being modest

[JebemMajke]

Can you post schematic please? Or AMT schem's, if you have any.

This isn't an AMT design... Schematic is linked on the first post

http://dl.dropbox.com/u/11178619/Soldano_Avenger_FET_Preamp.JPG

I know that this is not AMT design, but it's based on it. And that is why I've asked for AMT schem's, if you have any.
Anyhow in your opinion how does this fare compared to AMT's S-1 and to GT lab's fet/mosfet soldano emulator ( this one

[defaced]

I know that this is not AMT design, but it's based on it

Actually, his schematic is just a modified version of the tube schematic for the preamp that's floating around (which is a working and correct schematic to the best of my knowledge, I've built it). 

[J0K3RX]

Can you post schematic please? Or AMT schem's, if you have any.

This isn't an AMT design... Schematic is linked on the first post

http://dl.dropbox.com/u/11178619/Soldano_Avenger_FET_Preamp.JPG

I know that this is not AMT design, but it's based on it. And that is why I've asked for AMT schem's, if you have any.
Anyhow in your opinion how does this fare compared to AMT's S-1 and to GT lab's fet/mosfet soldano emulator ( this one

This is based on the actual amp schematics that I found... not based on AMT at all except for the diodes between gate and source.

I didn't have good luck with the GTLab mosfet/fet ENGL 3 so I decided not to mess with those right now.. I spent too much time trying to get it to work and no cigar... Not to say that it doesn't work but just that I could not get it to work and I was most likely doing something wrong... To my knowledge only 2 of the AMT pedals have been cloned successfully, the B1 and the E1 which I traced from pictures found on the net in another forum. The B1 sounds really good but I like the Uberschall that I made using the tube amp schematic better. I had to guess on a lot of parts on the E1 but it actually ended up sounding really good, better than the B1 by far! Somebody traced out the S1 and the P1 and made schematics for both of them, I tried the S1 and it didn't work properly, I suspect the schematic was incorrect? I didn't try the P1 because I own an actual P1 so...

I really can't compare this to any other Soldano type clones since I have not built any of the others...  Another thing to keep in mind is that AMT scales their preamps down. If you compare the schematics of let's say the P1 pedal to the Peavey 5150 you will not see any similarities except for maybe the number of stages and the tone stack. I do not posses the mathematical skills or vast electronics theory to scale them down therefore I just build them with pretty much the same part values as the actual amp that I am attempting to copy... This method works great for me!

Note: Since I have been working on the Black Forest - Uberschall pedal I have come across some things that I am going to apply to this pedal as well! Very good things indeed!!!  I am not saying that it doesn't work as is, I am just saying that I am going to make some HOT modifications to it that will surely make it a monster after that!

I made the schematic for the E1 so I can post it here but the others were not made by me so I would rather not post them here... I can send them to you via email? And by the way, the AMT pedals bias @ 6v not 4.5 - 5

[mindmob]

YOU are the MAN !

I am looking forward to building one ... I have just finished building the Uberschall pedal, and it kicks /-\SS !

How can I add a noise gate to the SLO pedal ? ... the one You designed for UBERSCHALL ....

[Cap]

Wow Subliminal messages for another 6knobs layout in a 1590B??