Wanted: vacuum tube logic circuits

[bfranchuk at jetnet.ab.ca]

William Blair wrote:
> Actually, 24 of the 41 types of space charge tubes had filament currents ranging from only 150 - 200 mA.  The 12DL8 had the highest at 550 mA.
>   
I remember reading somewhere on the web about the high current. I did not dig any more.
As for pencil tubes ... I suspect most of them where for WWII use and the general public did not
know about them till after transistors made their impact.