freestompboxes.org

Anyone go a Proco Big Box Rat 1978 and fancies helping out with the missing values on this layout?

This is according to a schematic I have. It was a very close match to your board.

Ooooops !!

Looks like an issue with the image link. I'll see if I can figure out the issue.

ALRIGHT!!

The main differences I saw were:

Your 560R was 360R on the schematic. And, there was a 2M2 pull-down resistor
on the input side of the 22n capacitor. Other that that, all matched quite well.
(The 1N4002 was a 1N4001 on the schematic). Hope this helps !!

PP

Hey Pete,

Thanks for that!

I found a 1986 schematic last-night, and used that to get this.


Will do a a bit more research on the values changing over versions.

Looks like you didn't need my help after all. Darn, a day late and a dollar short again.

oh believe me, having someone else come up with the same numbers is ridiculously helpful, my schematic reading are notoriously bad!

So sincerely thank you!

it seems to be the same as the tonepad's rat.

hi everyone! can someone tell me is this verified schematic? what is the pots value?
i made rat clone using this topic and have some problems. effect doesn't work so good beacuse it's getting distorted very fast. i don't have so much ability to change the tone cause you can hear the tone is changing between 2 and 5 o'clock only. volume is ok. the sound at all have so much bass.
someone can help me with this?