Dennis W7QHO wrote: > I substituted a 6AC7 for the 6K7 first RF amp in an RAO-7. Made all the > difference in the world on 10M but way too hot on the lower bands. > > -- > Dennis D. W7QHO > Glendale, CA Yes. That's the way it SHOULD work. 6SK7 and 6K7 start to crap out about 20 Mhz. Ken W7EKB