How to determine the needed B+

Hello to everyone,
surfing on the net I have not found anything about "how to determine the needed B+" given a amp schematic.

For every technical article that I managed to find the B+ was always a given parameter in order to determine i.e. plate voltage of the rectifier etc.

Moreover in many vintage schematic there is no specification about the high voltage secondaries of power transformers nor the (needed) B+ coming out from the filtering circuit.

Could someone be so kind to explain me how to how to determine the needed B+ from a amp schematic (i.e. the one attached - what is the voltage that should be measured at the end - to the 6NS7GT tube - of the CRC filter circuit)?



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    Knight 10W_modificato.jpg
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