I'm trying to figure out the stereo link and I'm not having much luck. I have a PDF which came from API, handed down from fellow users. It has the same schematic section as earlier in this thread but with 4 more pages and stereo instructions. Here's the 525-C for reference:
http://www.bobbymcalister.com/DIY%20Photos/525/525Cschem.jpg
Here's some more of the pdf:
It suggests a switch between pin 7's too but I've tried that (with an 120 ohm resistor) and I cannot get them to respond to each other's input at all.
What worries me is the instructions seem to want to break the connection between 7 and 8 when in stereo (but not quad, just to clarify). This seems to be reinforced on the schematic here:
Two problems. First, the pin layout is partly the same and partly different here. Mine inputs are not set as 5 and 6 like this schematic but rather pins 8 and 10. My 525's are also labelled 525 B on the PCB and are from 1998. It would seem this is not the schematic of mine or the current reissue compressor.
Second, there is a physical strap on my pin 7 and 8 which is confusing me more. I don't know enough about electronics to see the role in the pin 8 on my actual 525. If it's the same then, if I'm reading this right, it is supposed to be strapped only in MONO!
Can anybody help me here? I think I'm going to post photos of my 525 tomorrow to help. Don't have a camera right now.
Thanks,
Bobby