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Enjoy the builds and please also visit us on Facebook and Twitter Now, there is only couple of small changes to the output buffer and volume control when compared to the original Rat.
The volume control looks like it could give you some trouble with the output level.
The filter is very effective and works differently from most pedals as it cuts highs as you increase it.
The volume will not provide a huge boost but a boost nonetheless.
Nonetheless, if you have your eyes on a second hand RAT 2, you might want to check the serial number under the pedal.
It can go from a nice overdriven sound at lower gain settings to a fat slightly fuzzy distortion at higher gain settings.
Pro Co Sound FATRAT Distortion Pedal with Selectable MOSFET Clipping and Thick Boost Distortion.
The TL071 slew rate is 13V/us, the LM308 is 0.3V/us around 40 times slower, it indicates how slow is the Rat op-amp is. Summarizing these 3 effects, part of the signature sound of a Rat is essentially the op-amp collapsing under pressure and how the high-freqs are attenuated and not treated in a linear way.
For the Rat maximum voltage gain, which is 67d B, the frequencies below 500Hz will be amplified without problems, but higher frequencies will have less and less amplification as the graph shows. The result of all this will be clipped by the diodes.
This filtering provoke that bass notes will be attenuated before the clipping action, making the low end less clipped and creating a The original Rat pedal uses the LM308N Motorola op-amp, the Texas Instruments OP07DP was a replacement op-amp used in the new models.
Part of the Rat's tone remains on the choice of the chip as a function of the Slew Rate, the Gain-Bandwidth Product, and the Compensation Capacitor: In the image above, the slew rate of the LM308 is shown together with the TL071 (standard op-amp used in stompboxes) for comparison purposes.