Hello everyone,
I wonder if there are any drawbacks to make EL95-based cathode follower buffer? Yeah, I understand that the load resistor will get hot when you drop 170V across it at 10-15mA current (acceptable for me). Loaded against 15K.
Thanks in advance!
I wonder if there are any drawbacks to make EL95-based cathode follower buffer? Yeah, I understand that the load resistor will get hot when you drop 170V across it at 10-15mA current (acceptable for me). Loaded against 15K.
Thanks in advance!
Last edited:
The signal level is 2-4V maximum on the DAC, but in front of the buffer itself, there is intended to be a potentiometer that significantly decreases the signal. I like that fact of -6V on grid, big headroom, better then ecc88 as I understand it.
In case of a cathode follower the headroom is very much larger than the grid to cathode bias voltage. In operation, if the grid voltage goes up, the cathode voltage "follows" and grid to cathode voltage remains (almost) the same.
But that sim screenshot seems to be for a normal triode stage, not for a cathode follower....
It is, but the plate current vs voltage vs resistor should be the same, as the resistances and voltages are in the equation...or not really?
Not really. You move the plate resistor to the cathode, and the grid connected to the ground via the grid leak resistor, and you end up with a very little current, because your resistor is also biasing the tube. You need to get the -6 V from somewhere.
I'd recommend using LTSpice instead, it is a pretty good simulator. The circuit below gives you a similar DC operating point as the one in your example: ~-6V bias and ~170V Vak. But that's, of course, if you really want ~-6V bias.