Modded Proco Rat 2....

Discussion in 'The Workbench' started by Michael Inglis, Jan 15, 2020.

  1. Michael Inglis

    Michael Inglis Active Member

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    resized.jpg EDIT: Picture above is the most recent with the 2nd internal on off on switch now externally mounted on chassi. This switch is like the other but controls the low end gain instead of the high end gain. In the left position the pedal is stock, in the middle position the high end or low end gain is removed from the circuit(again, left switch high end gain right switch low end gain), and to the right the gain frequency is now controlled by the external pots (seen on back), these are where the real magic happens. One pot controls high end the other low end gain frequency. But for either pot to be active the switch controlling it has to be all the way to the right. This probably sounds confusing but i assure you its not, im just doing a terrible job making this comprehensible. I could not possibly be happier with the results on this mod, they made this pedal my dream Rat!


    Resized 2.jpg Resized 3.jpg
    I have a motto regarding pedal modding, if i mod anything its not a quality mod if it looses functionality. So to be specific it should be able to go back to stock at any time. So this is really a few mods but i was just really happy with the results so i thought id post about it a little bit and down the line post again with some sound clips, my playing is up to snuff but ive never posted audio files or recorded a demo yet so this would be a great time to learn to do those things. Anyways to the mods....

    1. Swapped out the OP07 IC for an IC socket with an LM308 (a legit LM308, ive tested the pins and its a real LM308. I bought it from Juried Engineering they are on every major selling platform and have good prices. Also they sell the LM308N's with a socket which is convenient).

    2. I added a three way switch (seen in between the filter and volume control) that does a few things. But its connected to the resistor capacitor pair that controls the high/mids gain. Its functions are as follows,

    Right: Stock

    Middle: Ruetz Mod (disconnected R6)

    Left: Replaces R6(47 ohm resistor) with a B1K potentiometer (at 0 its brighter closer to stock and at 10 its warmer closer to the ruetz mod) This pot interacts really well with the filter control. If you wanted to you could have it wired standard so it would be warmer at 0 more like ruetz mod and brighter at 10 more like stock but i preferred to have it backwards to mirror the backwards tone/filter control. The pot for this mod is on the back side far left. Next to it is another pot that is part of the next mod...

    3. Added another three way (slider this time) switch that stays inside the pedal. Its connected to the other resistor capacitor pair thats next to the R6 pair. This pair normally controls the lower frequency gain. Its functions are as follows....

    Left: Stock 560 ohm resistor (so in this position that pair functions as it would stock)

    Middle: Removes the 560 ohm resistor from the circuit so the pedal relies on the 47 ohm resistor/cap pair.

    Right: This position goes to the other potentiometer mentioned above. It replaces the 560 ohm resistor with a B1K pot just like in the Ruetz trim pot mod but for the other cap/resistor pair. I wasnt sure about this at first but it turned out great.

    5. I almost forgot, i also changed the stock 3.5 mm power jack for a regular dc jack. It turns out all the new rats have these so i kinda think it would have been nice to keep the 3.5mm since thats a feature that isnt on the newer ones. But with me its really all about functionality and theres a reason that Proco finally changed the jacks lol.

    Summary:

    Some of the settings can be redundant if dialed into the extremes (but only a very little bit of redundancy and it could be removed if you wanted by using more specific pot values but B1k's are easy to find and work great) but this redundancy isnt something anyone would notice. I did these mods cause i refuse to dislike a pedal or guitar or amp etc. I feel like most anything can be "corrected" to suit your preferences. The Modded Rat now reacts much more like a highly versatile fuzz. It really reminds me of a Keeley Fuzz Bender. With the two pots active you can really dial in the high/mids gain and low end gain to suit your preferences. If theres one thing ive learned or had reinforced through this mod its that the best way to start enjoying something your not in love with is to add some more versatility to it. That way your more in control of what you get out of the pedal, guitar or amp. Too many options can seem overwhelming but as long as everything is laid out well and intuitive thats not a problem at all. I should add this mod is not intuitive at all lol. Its my pedal so i know what does what but if i was modding this for someone else i would certainly label everything and likely add LED's to indicate when certain controls are active or not. Anyways thanks for checking out my post. If you want to do any of these mods yourself message me with any questions and i can walk you through anything you dont understand in more detail.
     
    Last edited: Feb 17, 2020
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  2. pedecamp

    pedecamp Well-Known Member

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    I like the Rat I have one on my board, enjoy it! :yesway:
     
  3. Michael Inglis

    Michael Inglis Active Member

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    I should have added that a stock rat is an excellent pedal, you simply cant argue that point cause so many people have had such success with them over the years. But with any pedal really theres some set ups they work well in and others they work less well in. Im using relatively high gain HB's in both my guitars so being able to dial back the gain even more on the pedal helps. But when im using the coil splits in my guitar (which i also modded and sound just as good as real single's to me with a boost from an eq pedal in the loop, the high output helps with split coils) the stock rat is excellent. Also with vintage output humbuckers ive really enjoyed the stock rat. Its really all about getting everything to work together to its fullest potential when i mod anything.
     
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  4. DonP

    DonP Active Member

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    I have had a RAT2 for a few months, but a week ago I got a FAT RAT that had the socket and LM308 installed. I haven't A/B'ed them against each other yet.
     
  5. Michael Inglis

    Michael Inglis Active Member

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    I can certainly hear a difference, the Lm308 in my opinion sounds "slushier"/sluggish , you can tell its really having a hard time keeping up with the signal. But the OP07 can sound like that also it just takes a lot more level and gain to get there. Im sure you already know but its the LM308's poor slew rate that makes it sound the way it does. I really preferred the LM308 with the pedal unmodded (well unmodded as in stock except having the LM308 of course) and even with the Ruetz mod i preferred the LM308 but once i did all the extra pots etc. it made more sense to have the more efficient OP07 back in the pedal cause i can dial in the pots on the back to simulate that heavy sag/compression type thing the LM308 has going on but then if i want it i can also have a more controlled sound at lower gain etc. But i can guarantee you this, next month ill probably be back on the internet talking about how the LM308 is unequivocally better than the OP07 lol. When you have the LM308 in a proco rat 2 with the right set up its just a really great sound that you just cant get as easily with the OP07. Its really bad in a good musical way. There are some mods that are a must and others that are just for shits, everything in the post above is just for shits brother. A stock Rat 2 or a Rat 2 with the LM308 is more than enough to get "that" tone and then some. Ill sign my book, its the least i can do since i made you read it....

    - M. Inglis

    Afterword

    M. Inglis was born in 1990, his pastimes are guitar, pedal building, music, -redacted- being faithful to his girlfriend, mushroom cultivation and writing stupid long replys on the internet in his spare time. He resides in Texas with his 3 dogs and girlfriend. He has no best sellers as of 2020 despite the fact he writes several "books" a day.
     
  6. South Park

    South Park Well-Known Member

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    Are the Russian transistors any good . The Russian big muff is the muff to get
     
  7. mickeydg5

    mickeydg5 Well-Known Member

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    There is only one muff I want.
    On another note can you give more pictures?
    :)
    :)
    :)
    :)
    Of the inside.
     
  8. matttornado

    matttornado Well-Known Member

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    Cool! I love Rats! I had just about all of the different models over the past 30 years. My favorite is the Vintage big box re-issue from the 90's even though they all sound so much alike.

    Now I have a GGG clone I put in a EH Big muff Enclosure. Sounds just like all of the others I had.

    I found that the Op07 & LM308 sound the same and not even worth changing. If there are any differences, it's so subtle that its not worth the bother. It really makes no difference. It's been talked about to death on other forums.... Just because a part is obsolete or was originally used, doesn't make it better in any way.

    I tried the Ruetz Mod once many years ago and it sucked. I like Rats stock, especially for live use because it cuts some bass and cuts through a live mix well, that's what counts for me.
     

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