Re: EABC80 question
Yes there will be a voltage drop. Usually, the detailed data gives the info.
Unlike the 1N4148 where forward voltage is about 0.6V and is pretty constant, for a thermionic diode the voltage drop is much more dependent on current. It follows a 3/2 law whereas the silicon diode is exponential. See attached plot for the EABC80, where for 20mA current the voltage drop is about 4.2V (note the diodes in this valve are not all the same!)
The good news is that at low currents, the thermionic diode far outperforms silicon and has a very low voltage drop.
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