Two things seem to come to the surface in my dealings with the KW-1: the mod iron certainly can't be accused of being overbuilt and running it at 100% likely approaches its limits; and a quad of 6B4Gs instead of a pair would've worked better for driving it, especially at the 12,000 winding. ~ Todd, KA1KAQ
You are right. A pair of 6B4Gs is not sufficient to drive the 810 modulators. I use a pair of 810's in my homebrew xmtr, and drive them with a quad of 2A3's, which are equivalent to 6B4G's. A pair of 845's would be better still.
Don k4kyv
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