cathode follower outputs 200vdc

[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 

[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

[gbaddeley]

First stage has no bias arrangement shown. How are you doing it?
What is the load impedance after the 68nF cap? This will determine the low frequency response.

[ELS122]

I dunno, I just threw it together cause I wanted more gain 

it was actually the best working circuit I ever built.

but now I am remaking it and doing it "correct" now. or just copying other designs. I really should read more about tubes. well I guess I'll do it when I'll have time.
for now, I'll stick to already made things.

the input impedance should be 1M cause I added a 1M resistor. but there is probably a resistor in the circuit so I don't know, could measure it but I'm going to scrap the preamp that amp has, keep the active tone control and build a tube preamp for it.

in short: I was confused, didn't do any research, got it figured out, kinda.
thank's anyway!

[ArthurDent]

"I dunno, I just threw it together cause I wanted more gain"

A cathode follower is an impedance converter to prevent loading the previous gain stage and it will have a gain less than one. This is basically how it is used as a pass element in a power supply where the output voltage on the cathode of the pass stage 'follows' the grid voltage and is almost the same value. 

[ELS122]

"I dunno, I just threw it together cause I wanted more gain"

A cathode follower is an impedance converter to prevent loading the previous gain stage and it will have a gain less than one. This is basically how it is used as a pass element in a power supply where the output voltage on the cathode of the pass stage 'follows' the grid voltage and is almost the same value.

I know, it has lower than 1 gain so it only attenuates the signal. that's why I made a gain stage before it. I wanted the cathode follower cuz it was a solid-state amp I was feeding it into so  I didn't know what input impedance it was.

they are also used a LOT before tone stacks, cause tone stacks can load the input a lot more than just a gain stage. and cathode followers have a much lower impedance output