A friend gave me a WE 715B pulse modulator tube that he had in his stash for 40 years. I found info re the 715C which appears almost identical here. http://www.mif.pg.gda.pl/homepages/frank/sheets/049/7/715C.pdf
Has anyone found a good use for this tube in amateur radio? It has a plate dissipation of 60 watts with 225 watts input continuous duty but can pass 225000 watts in microsecond pulses! There are no curves for reduced plate voltage (say 1500 volts). The tube has four cathodes in parallel so can pass a LOT of current even at lower voltages. Looks like a fun tube to experiment with.