When a heater voltage is applied to an electron tube boiling electrons create a negative potential on the grid (typically -700mV) and a negative potential on the anode (typically -50 or more mV?), all with respect to the cathode (which has become positive by the missing electrons).
So if we connect an output transformer from plate to cathode or a load resistor from plate to cathode in fact we are supplying a small positive potential to the anode.
Electrons start to flow.
See also nearby posts.
No comments:
Post a Comment