Gray Ross Compressor Clone Research

[Steve Mavronis]

I'm researching this classic compressor sustainer pedal to make a clone from. All I see are people's modified schematics and layouts so not sure what is original and what is changed for improvement. But I'm not looking for any improvements even if they are better. This is so I can make a clone again of a 'vintage original' if you can appreciate what I want to end up with.

I've been starting to collect pictures of the actual Ross Compressor's PCB in another attempt to reverse engineer a new 'spec' layout as I successfully did with my gray 250 clone. But one thing I cannot find yet are pictures of the Ross Compressor trace side of the PCB so I can see where parts connect point to point with each other. Does anyone have pics of the trace side? Finding pictorial detail info on this pedal is much more elusive than I expected. If you have any (original gray model if possible) Ross Compressor pictures of the circuit board from both sides please post them in reply to this topic, thanks.

My only fallback is to compare user "modified" schematics of the Ross Compressor with the similar '76 MXR Dyna Comp, since I do have pictures of the component and trace sides of that earlier pedal to reverse engineer a new layout from. This is last resort since I'd probably end up with a hybrid and want a pure Ross to base a clone from in this case.

[Steve Mavronis]

Here are some schematic reference links. These examples all differ so which one is most accurate to the original?

General Guitar Gadgets - J.D. Sleep schematic:
http://www.generalguitargadgets.com/pdf/ggg_dnr_ross_sc.pdf

Fuzz Central:
http://fuzzcentral.ssguitar.com/ross.php

Geofex - R.G. Keen schematic:
http://www.geofex.com/PCB_layouts/Layouts/d&rpub.pdf

Tonepad (I have the PDF but not sure this is the link since my Vista PC gives an error) Comparous schematic:
www.tonepad.com/getFileInfo.asp?id=9

[icculusdividedthesky]

I am attempting to undergo this project as well and am having the same issue as you with respect to the original schematic.  I know it is several years later, but did you have any success locating it?

Cheers