Focus Grid Charge Level Shift
(D)
The focus voltage is set by a resistive divider string from the cathode, with an intensity-focus
correction bias developed in a manner similar to that of the control grid bias voltage described
above. FOCUS LIMIT potentiometer R14 sets the focus grid to approximately -2500 V dc,
and the focus bias is generated by a clipped sine wave at the junction of C9 and C10. This
upper clipping level is set by VR2 (+82.5
V),
and the lower clipping level is set by the
FOCUS GATE voltage from A1A2.
2 A1A3
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