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A matter of choises

Some people uses 250V across the 6B4G (and often 60mA Idle current). This would give 15W Plate disipation. However, the OPTs often used is 2500 ohm load.
In this case the Lundahl OPT is a 3000 ohm making the designer to chose a slightly higer voltage. And to stay with the 15W dispation, the Idle current caused of that decreased to 50mA.

The 10 ohm resistor at the 6B4G cathode is just for measure purposes.
50mA current through it drops 0,5V which is negligable in this case.

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