I believe that the AE9K monitor program works only with the 8410 amplifier.? I have an 8100 and tried the program with it but was unable to establish communications.? I do have experience with using a terminal program such as Tera Term to talk to the 8100 over the USB connection to the amp, which creates a virtual serial port.? That's how you change the grid bias when you change tubes and it's how Alpha sets up the amp during manufacturing.
There are a couple of specialized Alpha groups here on groups.io.? There is one for the 87A and there was one other but don't recall which it was.? I usually use the Amplifier group on eHam and Glenn, AE0Q, responds to Alpha questions there.? Which Alpha(s) do you have?
73, Floyd - K8AC
Floyd - K8AC