how do I calculate the cathode current on this "op amp" tube circuit?

[ELS122]

there's no cathode resistor. the grid is referenced to ground. how do I draw the cathode load line?

[gbaddeley]

Do some research on common cathode differential amplifiers. The 110k in the cathodes is essentially a constant current source. The anode currents will always sum to about 1.35mA. So the anodes will sit at about 62.5V below B+. The anode load line is like a normal common cathode voltage gain stage.

[ivi_yak]

hi looks like 3.2mA

[ELS122]

Do some research on common cathode differential amplifiers. The 110k in the cathodes is essentially a constant current source. The anode currents will always sum to about 1.35mA. So the anodes will sit at about 62.5V below B+. The anode load line is like a normal common cathode voltage gain stage.

thank's, but can you link a good article on common cathode diff amps? I can't seem to find any that are talking about a design similar to the one i found.
also wdym they always sum up to 1.35mA. why would that be?
sorry if I'm asking like total beginner questions, I just seem to become dumb when it comes to op amp's 

[pardo-bsso]

thank's, but can you link a good article on common cathode diff amps? I can't seem to find any that are talking about a design similar to the one i found.

For tubes circuits Fun With Tubes http://www.funwithtubes.com/ and The Valve Wizard http://www.valvewizard.co.uk/ cover in great detail almost everything anyone needs to know.

As for your particular query this is a good starting point: http://www.valvewizard.co.uk/acltp.html

[ELS122]

thank's, but can you link a good article on common cathode diff amps? I can't seem to find any that are talking about a design similar to the one i found.

For tubes circuits Fun With Tubes http://www.funwithtubes.com/ and The Valve Wizard http://www.valvewizard.co.uk/ cover in great detail almost everything anyone needs to know.

As for your particular query this is a good starting point: http://www.valvewizard.co.uk/acltp.html

well valvewizard doesn't have super fun stuff like class B2 stuff 
anyway, re-reading the article on valvewizard on LTP pi's I now understand how the op amp circuit works and how to draw a load line.