Pro Co Sound has released a Limited Edition White Face RAT pedal. This is an accurate painstaking reproduction of the original 1985 RAT circuit that includes the LM308 chip.
I remember having a RAT back in the day and I do believe that this new Limited Edition version actually sounds better.
The new Pro Co Sound Limited White Face RAT is super simple to use and you can get a great sound instantly. There is plenty of range on each control for a wide variety of sounds.