Yes, and I actually had an "A" and a "NON-A" R-390's at the same time, hihi. I KNOW what you mean, but there is a similarity, Ron, there is the same wide difference in the two TU's. My "new to me" ST-8000 copies MUCH better than anything else I have in the shack, even my special, low tone, special filtered ST-6000, hi. It's truly amazing. 73, Don, WB5HAK