I have noticed that the TEC drivers are absolutely necessary. I made my own laser diode driver (constant current) to get rid of the enormously bulky Hyb B controller. Inside the Hyb B is a small TEC driver board that I used to keep the temperature of the LD constant. I'm not driving the cavity TEC at all at this moment but I've heard that this is necessary. I will make my own dual channel TEC driver some day but today I'm running my laser at very low power and at room temperature, and only for short times. This seems to be ok but I won't get a lot of power out of it... Another issue left to solve once my projector is working properly.