In message <4359840E.4080709@sbcglobal.net>
          Marcel Duchamp <marcel.duchamp@sbcglobal.net> wrote:

> What effect does adjusting the Vg3 voltage do?

Standard focus/defocus. One way focusses the beam spot, the other way causes
the spot to get larger. When the Vg1 is in the "dead zone" (big spot), it's
impossible to focus the spot on the CRT.
The -500 and +240 remain stable all the time.

Later.
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