|
wa2ise is explaining, in the post above, what happens to the output
of the horizontal output tube.
The question is the oscillator itself. As I said, there are several different
forms of this. The usual suspects are either based on a transformer, usually
with just one oscillator tube, or a two tube multivibrator circuit. The latter
comes in two basic forms: one has each plate connected to the other grid through
a capacitor, the other has the plate of tube 1 connected to the grid of tube 2 by
a capacitor, and the two cathodes connected together and connected
to ground by a 1K resistor. In the latter case the grid of tube 1 has to have a low
resistance to ground (typically 10k) and the plate of tube 2 is connected to
B+ (or in an electrostatic set, the CRT high voltage) by a high resistance , 1 to 40
megohms, in parallel with a capacitor to ground.
|