I have a Hewlett-Packard YIG oscillator, model 5086-7331. I need to use it as a milliwatt source to drive a TWT amplifier for a fixed-frequency transmitter. How can I connect the YIG oscillator to make it work? It has a bias board, part number 5061-1069. There are seven input leads: (1) EMITTER/COIL; (2) -40V; (3) +20V; (4) +5V REG; (5) -10V; (6) OSC BIAS; (7) GND. Most of these are self-explanatory. (1) and (2) go to the magnetic field coil. But what do I do with (6)? What is OSC BIAS? Inside the YIG oscillator is some kind of amplifier, with collector, drain, gate, and emitter terminals. Does anyone have a diagram of what is inside?