Walrus Audio Iron Horse

[UnklePhil]

I am looking for a long time, but still unable to find any schematic or vero of this one.

Watching the gutshots found on google, reading forums, i am now quite sure it's a LM308 Rat with a charge pump, Si diodes clipping and a switch adding a LED (blue? orange?) for asymetrical clipping.

But there are much more caps than in the original Rat, so ... more to find!

Does anyone could help?

[Bolsyo]

The best gutshots I found, LM308, hard to read the other chip (4526P charge pump?):

According to Walrus website it's a 3 mode clipping switch:
"Middle will give you a wide open, non compressed signal." - On-off-on switch with middle lug connected to ground.
"Left will give you some compression" - This setting probably adds in the LED.
"Right will give you a higher amount of compression" - Seems to be D2 and D3.

Might just be the typical RAT clipping with two 1N914 for stock mode, red LED for Turbo RAT mode, and only op-amp clipping/boost in the middle (pretty sweet on lower gain).

[UnklePhil]

No more than 2 si diodes and 1 led on your pic (found this one too).
So, switches position are something like symetrical Si / no clipping/ asymetrical Si +led... Like I said.