21 Aug
2008
21 Aug
'08
10:26 p.m.
On 21 Aug 2008 at 20:13, William Blair wrote:
Going to the low plate voltage is a nice idea from a
practical view but I
wonder if it may compound issues of point 2 above. It will reduce the voltage
shift between the plate and grid circuits that needs to be accomplished, but it
may also reduce the voltage swing between the 0/1 logic levels. How it works
out in the balance will be interesting.
Just before transistors began to be used in auto radios, "space
charge" tubes made a brief appearance, running their plates and
heaters from the 12v battery. No vibrator supply. Some of the
earliest transistor designs used a transistor only in the audio
output stage, among them the Delco "Wonder Bar" models.
Jeff Duntemann has a nice page on this stuff, along with datasheets:
http://www.duntemann.com/12vtubes/12vtubesindex.htm
Cheers,
Chuck