Hi Phil, I hope you saw my data. (I tried to zener the CB junction, I got the reverse bias voltage up to 102 V and ran out of power supply, with no current.)
From your comments you seem to think that this ~300 mV of compliance is expected. I must admit that when you compare this to a saturated transistor it just confuses me. (I don't understand saturated transistors all that well either.) For a saturated transistor I have this model (picture) of electrons diffusing across the (lowered potential) base and into the collector, such that the collector (voltage) eventually is below the base.
For the zenering EB condition, it seems like I'm pulling holes out of the base, raising the voltage barrier between the emitter and collector. And I don't see how this allows more electrons to fall into the collector. How are the current's linked?
I kinda like the two diode model of the transistor here... That seems to work for me. (Oh and it's OK to just ignore this... it's not all that important.)
George H.