Just want to pass this by this learned crowd.
I am currently building a 500 watt 2 meter amp using a 4cx250 vacuum tube. However upon reading the specs on a 4cx400, aside from some small physical dimension and small interelectrode capacitance differences, I believe I can use the 4cx400 instead of the 4cx250 in the same circuit. According to the reviews of the tube, the output is cleaner and it will provide about twice the output power as the 250.
What do you think?