I must decline the honorific of "Historian" as that's a title i cannot live up to. 

The quoted material puzzles me. There was time of course when there were only triode valves. The alternative to the superhet was not just the regenerative circuit. Straight TRF aircraft receivers BC-229 / 429, RU, and the early predecessor Type D all offered the DF feature. 

What a shame Major Alexander's tragic demise. I was surprised to read that he was married. You might think that could have pulled him away from his decision. But it doesn't always work that way.

Why am i up at this hour? A careless heavy lift leaves me unable to sleep from the pain level. I'm hoping the Ibuprofen kicks in and works soon.

-Hue Miller