Quote Originally Posted by gtj View Post
Assuming you DON'T mean the 5 things with the flame heat sinks on them, then black or blue things are just choke filters, basically wire wrapped around an iron core. No difference between them. I have a 2 503's with black ones, 1 503 with blue ones and a 505 with black ones.
I thought those were the voltage regulators as looking at those I could tell the BX2 has 5-phase power?