"that would require a choke with a reactance of 22,000 ohms, or about 2000 uH. I have never seen a design with that much inductance for the plate RF choke, or anywhere close to it.." I'll bet you have. As I recall, almost all of the 6146 rigs, along with the novice transmitters, use 2.5 mh rf chokes. And, of course, there is the ARC-5. Colin K7FM