I find the RCA black plate to be good all around. Well balanced and good extension on top and bottom. That said the difference between the two different RCA's, Sylvania's and GE's is not that great. They are all fine tubes.
I have not tried the Raytheon's. I believe the early one's from the 50's to 60's were made in the U.S. Later production moved to Japan. "still good tubes from what I read". I think you may like any of the tubes mentioned. You may still like the EI's better? Rolling tubes can make you a little crazy:)
I have not tried the Raytheon's. I believe the early one's from the 50's to 60's were made in the U.S. Later production moved to Japan. "still good tubes from what I read". I think you may like any of the tubes mentioned. You may still like the EI's better? Rolling tubes can make you a little crazy:)