[Amps] eb-104 bias question

[Dan Sawyer]

All, I am building an eb-104. After several false starts, assembly 
errors, the board is up and running at low power with two devices. The 
current question is related to the bias circuit. I am using a 13.8 volt 
supply and have the bias set to 6 volts. When the first device is 
brought up to 200 ma the bias source drops to 5.8 volts. When the second 
device is brought up the voltage drops even further. Needless to say 
this would make balancing 4 devices difficult.

Is there an update to the bias circuit?

Does anyone have suggestions on how to debug the voltage regulator circuit?

Thanks, Dan