On 14 Nov 2013 at 22:34, Fuqua, Bill L wrote: > The screen to plate mu is around 6 for the 4CX250b. > > 73 > Bill wa4lav Bill: Where do you find those sorts of specs? I have needed some like those for many years....such as the grid to screen transconductance of a 6AG7 for instance. Ken W7EKB