So you can see the heater voltage is down quite a bit from the 6SL7 which was 6.36v . This is the unregulated power supply doing it's thing of dropping the voltage as the current draw increases. The 6SL7 draws 300ma and the 6SN7 draws 600ma so that all makes sense. Under-volting the heaters a little is no bad thing as it increases tube life.
The plate voltage is down below 100v which I think is the ideal in this circuit and it is a lot closer than the 6SL7 so a good result. Also the grid voltage is up around 2v where it should be.
So the technical results are all very good.
Speaking of ideals, in this circuit with a B+ of 200v , the ideal plate voltage would be 100v and grid 2v , which results in about 3ma through the tube. The Little Dot resistor values work to give these results as long as the tube is suitable. So if you are looking at graphs in the datasheets then you want to find tubes with graphs where the values of plate volts = 100, grid volts = 2, and current = 3ma roughly converge.
Doesn't the fact that the 6SN7 draws 600ma present a problem? I have been under the impression that the LD's limit is about 500ma?