Pro Co FATRAT

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Pro Co FATRAT

Postby ggbb » 13 May 2016, 16:17

Does anyone know what Pro Co has done to the RAT to make it a FATRAT? I'm talking actual circuit and/or component changes not sound/features. If anyone has any gut shots or an actual verified/traced schematic that would be great. I'd like to update my comparative multi RAT schematic (below) to include this new RAT variation so I'm really curious as to what they've done.

Image

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Re: Pro Co FATRAT

Postby Cub » 15 Jun 2018, 15:33

Little bump here. Has anybody seen a Fatso in the wild yet?
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Re: Pro Co FATRAT

Postby Ichabod_Crane » 16 Jun 2018, 14:38

Hello, I don't know if someone knows the real schematic, but I can assume it, though I didn't try the original Fat Rat.
We can see the description here: https://www.ratdistortion.com/product/107/fat-rat
The pedal has two extra switch: the clipping switch Mosfet/Stock and the Fat switch: Stock/Fat.

- Look at the image attached. You can see how you can add the extra clipping mode using a DPDT switch.
- About the fat mode we can assume that it could be the Ruetz Mod, but if you want to use just a switch instead a pot you have to use a DPDT switch to select the stock resistor or a 1k resistor.
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Re: Pro Co FATRAT

Postby thesmokingman » 18 Jun 2018, 14:33

my notes show the fat switch to add a 6u8 to C7 and the MOSFET clipping to be bs170+1n270 pairs

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Re: Pro Co FATRAT

Postby p.eat » 25 Jun 2018, 11:20

thesmokingman wrote:my notes show the fat switch to add a 6u8 to C7 and the MOSFET clipping to be bs170+1n270 pairs

I can confirm. Fat switch adds 6u8 in parallel to C7. The Fat Rat I had used a BS170 and a BATxx for the Mosfet-clipping. The rest was to standard wf specs. My personal opinion: I found both switches rather useless....
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Re: Pro Co FATRAT

Postby brownwhopping » 23 Oct 2018, 19:48

p.eat wrote:
thesmokingman wrote: I found both switches rather useless....

Why? I used to make Rat with 3-way clipping switch (GE, SI and LED) and it sound very similiar. Is it this?
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