API

API 825 PCB-1 scan

API 825 PCB-2 scan

API 550B

API 212L

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gyraf said:

API 2520 opamp internals (I can't remember who the author was, unknown precision)

Click to expand...

that's a schematic that I drew. A friend de-potted the module and drew the schematic. I transferred it to CAD. This probably dates back to late 1970s.

API 550A pack with schematic

Guys, hello!
212 API mic pre.

528 Input Module

I just put the Legacy and Legacy Plus manuals on my web site under API

they are early Paul Wolf versions and have many hand drawn notes because there are no others.

http://waltzingbear.com/Schematics/API.html

http://waltzingbear.com/Schematics/API/API%20Legacy.pdf

http://waltzingbear.com/Schematics/API/API%20Legacy%20Plus.pdf

Alan

Found it useful

API E548 Echo return module part one

API E548 Echo return module part two

API E548 Echo return module part three

Rough composite of Walrus' API 548 Skiz attached

API 912 preamp schematic.

I have all other documentation for the 3224 console, which I may try to post some relevant info on here.  If you need anything specific let me know.  I don't think I will get everything digitized anytime soon as there are over 200 blueprints including wire lists/pcb layouts/ mechanical drawings/ schemo's etc. 

The contents of this link will periodically update with new info.

EB

https://www.dropbox.com/sh/hmf4jthtz6mg7ij/AADl5sya0n2-46MQS0NHWkyva?dl=0

Another API transformers data sheet. A bit higher quality and in color  8)

Source: steampoweredradio.com

553 EQ re-envisioned by Peterc Front Panel diagram

API Card Size with millimetres

Schematics, install, test, etc.  Includes pinout change for early 525 as well.