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RE: Cathode Follower Line Stage

With a standing current of 25mA through the choke that has a DCR of 2.2K there's a 55V drop. The potential at the tube's cathode will then be 42V (55V-13V). The grid bias for the chosen OP needs to be at 36V; it would seem that neg supply should be at -19V. where am I wrong?

Also - and I haven't given this much thought yet so I could be wrong, but shouldn't the input shunt resistor be referenced to the negative supply instead of ground in order for the tube to operate as a CF? If that's the case, then of course an input cap would be needed. What say you?


Edits: 05/16/17 05/16/17
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