I follow the design of the Concertina phase splitter right up to the section entitled 'Calculation of the Cathode Bias Resistor and Feedback resistor'

At what point is the 47k Rl for the first anode chosen? I don't see any mention of it before this point so I'm assuming it's something simple that I've missed.

In the same section: where is the 190V derived from to find the anode current?

Any help would be much appreciated.

TIA

cgrums