Not difficult to work with, and making them work with analog/digital mixed PCB designs is something I'm comfortable with. However, your requirements actually sound like you have a client who is a) not knowledgeable enough to be working with such things, or b) on a restricted list of personnel for whom such knowledge is prohibited based on what they intend to use it for.... IMHO.Hi Engineers! Want some consulting work? The catch is its vacuum tubes- tetrodes. I bet no one here plays with these anymore. If you do, please get in touch! Thanks.