Proco - Rat 1986

[Mer2112]

Hi,

Is there a general consensus on which "Original" Rat schematic is correct?

I've seen these:

https://www.diystompboxes.com/pedals/PCRAT1.GIF

http://www.beavisaudio.com/Projects/FKR ... _stock.gif

http://www.tonepad.com/getFile.asp?id=89

I want to build an original and would like to do it right.

Is there a schematic for the Vintage Reissue or is that the same as the original?

Thanks for the help,

Eric

[modman]

Hi Eric,

Always check the Schematic Index first, then you will find:

http://happybob.com/rstrand/rat/rat_versions.htm (good links for schemos AND history)
http://webpages.charter.net/daosmun/

http://analogguru.an.ohost.de/193/schem ... t-1986.gif

Also note DH's remarks about the diystomp schematic.

I traced out my Rat 2 today. I'm looking to do some mods to it and I wanted to have a "stock" schematic for reference. None of the schematics I could find on the 'net matched my unit (AG's is close and the one on TonePad is close), so I decided to trace the whole thing out and share it. It was a good exercise - probably my first full "official" trace of a stompbox... an easy one too.

http://www.aronnelson.com/gallery/d/175 ... o+Rat2.gif

I wonder,
This one has been on my site for some 2 years:
http://www.dirk-hendrik.com/proco_rat.pdf and has been posted on diystomps as well. The 3 differences I do see is the biasresistor for the opamp 2M2 vs 1Meg, as well as the gain pot. Of that one I do know that I took the measured value since it was too far off to be a convincing 100k (as seems to be the case in RG's version, see remark below).
Finally there's the LED FET bias resistor that differs.

However This makes one wonder wether there's component changes in non-critical places within one version of the RAT already..... And jus to make sure, did you record the PCB texts on your RAT as well (like" the baddest bos for the baddest axe")

Other than that,

Can this schemversion of the Rat:
https://www.diystompboxes.com/pedals/PCRAT1.GIF

become forbidden? It's wrong wrong wrong wrong. (And let's nut fuzz about that input FET but let's do fuzz about that opamp with positive feedback!!

viewtopic.php?p=11081#p11081

have fun!

[Mer2112]

Thanks Modman,

It looks like the Veroboard plan is right on.

That will be my first attempt.

Thanks Again,

Eric