Testing Different IC's in a Rat Distortion Pedal


I do love the Rat pedal.  I don't actually own an "official" one, but rather a clone made from a ready-to-solder circuit board from General Guitar Gadgets.  I tend to switch it on and off my board every so often, and from time to time I dream of making my Rat clone even more awesome.  Recently, in that spirit, I was looking at Jack Orman's wonderfully informative  page about his moded version of the Rat called the Fat Gnat.  He mentions that there are some alternatives available for IC selection.  This makes sense because althought the LM308 is the orginal chip and "holy grail" that most people use when builidng their own DIY Rat, I have heard that some versions of the Rat use the TL071 or other chips.  Jack recomended trying the TL071 as well as his favorite the NE5534, in addition to the LM308.  So I did, and I recorded the results.  As in the other IC tests, I recorded a clip into my Boss looper, and then ran that same loop into my Rat clone 3 times, each time through a different chip.  

Check them out.  Which one do you like?  


  Testing Different IC's in a Rat by afrogoose

3 comments

  • kennyramjam

    kennyramjam kalamazoo, mi

    308 sounds vague. 5534 sounds small. I like the 071 best. Guess I better get to work and change my op amp!

    308 sounds vague. 5534 sounds small. I like the 071 best. Guess I better get to work and change my op amp!

  • Andrew Martin

    Andrew Martin

    Thanks for listening kennyramjam! Good luck with your Rat!!

    Thanks for listening kennyramjam! Good luck with your Rat!!

  • kennyramjam

    kennyramjam kalamazoo, mi

    I like the difference it makes in my Rat. It's better for playing Hendrix type riffs high on the neck using wound strings...something he did quite often...because the top end is already diminished there and the 071 seems to preserve it better. Also allows more high overtones through and this helps to induce harmonic feedback when needed. Haven't played it at a gig yet but I bet this is going to be a keeper!

    I like the difference it makes in my Rat. It's better for playing Hendrix type riffs high on the neck using wound strings...something he did
    quite often...because the top end is already diminished there and the 071 seems to preserve it better. Also allows more high overtones
    through and this helps to induce harmonic feedback when needed. Haven't played it at a gig yet but I bet this is going to be a keeper!

Add comment