Cobra 2000, 148 AM Bias and operating classes/class in various modes

Hello all, I am posing a question here in a new thread in order to not de-rail another recent thread with an off topic discussion.


My question is in regards to this photo:
.
Is the bias supply, connected to the same bus as the RF pre-amp (2sc1973) and the TX mixer? (Looks Like It Is)

And if so what does this mean for AM operation, biased class C or no?