Roger:
Interesting. You used 6.1~ 6.2 V zeners to compensate for a tr junction. A long long time ago, in a distant design lab I didn't use zeners for compensation, In some circuits that had dc, we often used two transistors, NPN and then PNP? for example so their junctions would cancel out. Can'tt remember what the circuit was for now. I also? can't remember if a zener was more expensive than a tr. ( May be that was reason?, or they didn't want a zener on the BOM) I remember one time, it didn't work as well as expected so potting compound was dumped on the temperature sensitive areas! The factory didn't appreciate that they need to use liquids!?
P
