Electronics > Beginners

cathode follower outputs 200vdc

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ELS122:
I have a basic triode gain stage going into a cathode follower without a coupling cap and the cathode follower is outputting 200volts? shouldn't it not output dc?
I didn't have the gain stage before and it didn't output dc so  :wtf:

gbaddeley:
Under DC static conditions and normal biased operation, the cathode voltage will be more positive than the control grid, by a few volts.  Check the theory of operation of your circuit.

ELS122:
so basically I need a coupling cap if I want to connect the cathode to something that needs a clean ac signal?

the theory behind it was really long so I thought that I could just follow the circuit that was shown and it will work.
I guess I'll go read it

IvoS:
Post a schematic.

ELS122:
I know that the first stage is over biased but ehh...

I now added a 68nF couplig cap on the output of the cathode follower cause it was outputing dc

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