30 Aug
2008
30 Aug
'08
4:57 p.m.
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.