[Boatanchors] Suppressor grid modulation

[mac]

The confusion with the 813 likely stems from the fact that the  
standard base diagram (5BA) called out for this tube in the ARRL  
Handbooks (since 1946), Fathour, Sibley, and other references seems to  
show a suppressor grid connected to Pin 5.   ARRL Handbooks 1941  
through 1945 mistakenly show the 813 as some kind of a dual triode and  
prior to this do not list 813 specs at all.  At least in my library,  
only my 1948 Radio Handbook shows a base diagram with beam forming  
plates.

Dennis D. W7QHO
Glendale, CA