What the heck is that???

[Kevin Mitchell]

Is there enough value in the pedal to not cut that thing open? The suspense is killing me...

I reeeeeeaaaaaally prefer not to do that. I haven't seen to many of these around, and would prefer to leave it as "unmolested" as possible. Besides... I really hate having to destroy something working, just to satisfy a curiosity.

On the other hand, I may just ring up my dentist again for another X-ray session. She was really cool about doing so for my Breg Sweep wah, so maybe she'll be game once again.

Hey someone had to recommend the destructive route 

+1 for the xray. That would be super cool to see!

[digi2t]

+1 for the xray. That would be super cool to see!

X-ray is cool, as long as you know what you're looking at, and looking for. Here is the shot of the Breg Sweep wah she snapped for me;



What it actually looks like...



Needless to say, it took me a while before I figured out how to interpret what was what.

Ultimately, I had to shelve the project due to the triple gang pot used in this. Yeah... triple gang. With three different pot values no less. 

[amptramp]

I don't think you are dealing with a complete lack of information here.  The large lumps appear to be film capacitors and typically they would be positioned so the associated pins were in line with the ends of the capacitor.  This may enable you to fill in some of the circuit design, maybe enough to show what the circuit is all about.  There appear to be different capacitor values that are proportional to the size of the lump.

Packaged electronic circuits (PEC's) were more common in the tube era where there was the audet, a circuit containing the resistors and audio coupling capacitors for the first audio and output stages of a 5-tube radio, the pendet which was like an audet for battery tube portable AM radios with an additional R-C network for the screen grid of the first audio tube and the most common, the integrator, a 3-section R-C lowpass used to synchronize the vertical oscillator in television sets.

This might fill in enough information that you could get an idea of what the designer was trying to do and maybe derive the schematic from that.  It is rare to put active devices into one of these PEC's but who knows, maybe they tried that.

[Kevin Mitchell]

I had to dig up your old post about that Breg Sweep wah. Now I'm super interested. Any demos? Looks like they tried real hard to keep folks from copying it. Of course, they weren't expecting anyone to xray the damn thing 

Feel free to PM me the schematic if you still have it. Would love to breadboard it when time permits.

[PRR]

Couplate. Some US sold ones back in the day there are schematics for. Sprague used to make them.

Just ran across what seems to be the birth-announcement for the Couplate. 1947. This gives the maker as Centralab, but I know Sprague made very similar products, maybe under the same name?


ETA--- another reference...