24 Apr
2011
24 Apr
'11
7:11 a.m.
[...]
- CRTs also generally have a control grid, but it
might be said to be a
bit of a misnomer as the input signal is often/usually applied to the
cathode.
Agreed, particualrly with the 'often/usually' part. It's not 'always'
:-). I am sure I worked on something recently where the CRT brigthness
modulation was applied to the first grid ('control grid'). Possibly an
HP2623 terminal.
[...]
- The control grid is usually but not always the first
grid after the
cathode.
Indeed. I've seen valves (tubes) which were designed to operate at 24V
anode (plate) voltage and which had an acceletor grid (connected to a +ve
voltage source) betwene the cathode and control grid.
-tony