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Discrete Opamp Installation Tips & Tricks Discrete Opamp Installation Tips & Tricks

     I have been fielding numerous emails regarding proper discrete opamp installation for my preamps and other modules. I thought I would post a few bits of information to help make this easier for those who do not know. The tips and techniques specified here are only for 2520 style opamps that seat in the Mill-Max sockets that I supply.

     The Mill-Max sockets are very stiff when they are virgin. So stiff that you may get the feeling you will break something if you keep pushing on your open or unpotted DOA. A properly seated DOA is very solid and will typically never come out even when the module is moved/turned around a quite bit.

     A simple way to prep your virgin Mill-Max sockets can be accomplished with a small paperclip and a few minutes of time.

Click to enlarge
Click to enlarge
Lets start by locating a small paperclip. The wire of a small paperclip will measure about .034" (.86mm) in diameter. The typical DOA pin is .04" (1mm) in diameter. You definitely want to make sure that the paperclip is a little smaller in diameter than the DOA pin. The tape is not necessary. It only demonstrates the depth the paperclip will travel in the socket. That's about .2" (5mm).
Click to enlarge
Click to enlarge
Position your module flat in front of you on a desk or table. DO NOT HAVE A DC POWER SOURCE CONNECTED AT THIS TIME!! Insert the paperclip into each of the six Mill-Max sockets.
Click to enlarge
Click to enlarge
You will insert the paperclip until it bottoms out inside the Mill-Max socket. Some significant force may be required. Don't worry. You will not hurt anything. Don't twist or turn the paperclip. Just insert it straight and then pull it out. Again, the paperclip will travel down about .2" (5mm).
Click to enlarge
Click to enlarge
Once all of the sockets have been loosened up, it is time to install the discrete opamp. It is important to try your best to push down evenly to prevent bending over the Mill-Max pins on the DOA. Use your fingertips to push on the PCB, NOT ON THE COMPONENTS!!
Click to enlarge
Click to enlarge
Continue putting even downward pressure on the DOA unit it will absolutely not go any further.
Click to enlarge
Click to enlarge
When the DOA is properly fully seated, you will have approximately 3/16" (4.8mm) between the top of the main PCB and the bottom of the DOA PCB.

     Simple as that! Now, have some fun and enjoy!

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Classic Audio Products, Inc. is not affiliated with API. Customers and fans should not refer to Classic Audio Products, Inc. as "Classic API." API is a registered trademark of Automated Processes Incorporated. Classic Audio Products, Inc. has no affiliation with Automated Processes Incorporated.
01.gar2520 DOA Full Kit Bundle
02.DOA PCB Socket Set
03.gar2520 DOA PCB
04.Toneluck 2PDT Pushbutton Switch
05.C&K Black Bullet Switch Cap
06..156" KK Female Terminal Contact
07.C&K White Bullet Switch Cap
08.EA2622 Input Transformer
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