250 for the 1960 (and later) versions. See:
http://www.g8wrb.org/data/Eimac/4X150A.pdf
I don't know if those were used in the SS-80, but the part number
isn't always the most reliable indicator.
When the design was upgraded, one of many times, they stopped being
4X150As, and received a new RMA (and I think a new Eimac) number.
Basically a frequency derated 4X250.
--
Will