So I am looking at an old copy of QST, April 1940 to be exact, and I see this. What are your thoughts and opinions?
Interesting that the mod iron impedance is almost exactly that of a Heathkit Apache 11K / 3K.
I just checked (the Bay) and 809's are still available, although i am sure a later /better pair of tubes could be used.
810's are there also but both types are a little spendy, for my taste.
