Didn’t see Angel network but I suspect Dr. Wennerberg has been deceased for many years. Now that I think about it, he would have to be in his early 100s. Possible but not likely.
I just remembered my Brother’s Zenith short wave. It was a Trans Oceanic. For such a few tubes it sure did sound great and received very clearly.
We know who lost Iran. Now Obama will loose Turkey.
You are correct. Trans Oceanics had the tube “presence” in the audio. they had to minimize the tube version many were used on battery only. The more tubes, the more current.
I still have several tube rigs. My favorite is my Collins Twins. 75S-3 32S-3 with accessories. Incredibly smooth and stable PTO.