----- Original Message ----- From: "Donald Chester" <[EMAIL PROTECTED]> > I recall there was a Central Electronics rig that had a no-tune broadband > output network with a tube type final. They sealed the whole thing in > something like epoxy, and gave no technical data on how it worked.
Yes but it was a patented device and the patent number was shown. I sent for the patent disclosure and built the coil as presented. It worked perfectly and I made measurements that showed it's own impedance to be 25 ohms and it would easily match 25 to 100 ohms 2:1 SWR. Mine was for a single 813 final. As I recall the network was in some ceramic that was nearly impossible to open short of an A-Bomb and many wondered what was inside since no-tune was a mystery at that time.. Mike
