The **K8 was widely used in that era. Has high conversion gain if I remember correctly which may have been one reason for It's popularity. Dennis D. W7QHO Glendale, CA ************ On Oct 27, 2014, at 4:22 PM, Kenneth G. Gordon wrote: > > Then again, knowing what we do about ARC engineers, perhaps they chose > the noisy 12K8 for a very good reason.