API

[jsteiger]

API 825 PCB-1 scan

 

[jsteiger]

API 825 PCB-2 scan

 

[drask]

API 550B

 

[gemini86]

API 212L

 

[mjrippe]

8-}

 

[rickc]

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

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.

 

[Whoops]

API 550A pack with schematic

 

[avdo]

Guys, hello!
212 API mic pre.

 

[Walrus]

528 Input Module

 

[waltzingbear]

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

 

[Floti]

Found it useful

 

[Walrus]

API E548 Echo return module part one

 

[Walrus]

API E548 Echo return module part two

 

[Walrus]

API E548 Echo return module part three

 

[boji]

Rough composite of Walrus' API 548 Skiz attached

 

[TubeMonkey]

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

 

[Zebra_PD]

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

Source: steampoweredradio.com

 

[peterc]

553 EQ re-envisioned by Peterc Front Panel diagram

 

[peterc]

API Card Size with millimetres

 

[mjrippe]

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