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511: Difference between revisions
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The lack of regulation means that variations in mains voltage results in variation of deflection sensitivity. | The lack of regulation means that variations in mains voltage results in variation of deflection sensitivity. | ||
In the '''511A''', the CRT cathode and anode voltages are produced by a 2 kHz oscillator that is powered by the 511A's +225 V<sub>DC</sub> regulated supply. | In the '''511A''', the CRT cathode and anode voltages are produced by a 2 kHz oscillator that is powered by the 511A's +225 V<sub>DC</sub> regulated supply. | ||
This results in vertical deflection calibration that is independent of mains voltage. | This results in vertical deflection calibration that is independent of mains voltage. Unlike in the 511, there are no chokes in the power supply. | ||
From SN 2406 upward, a dedicated calibrator stage uses one half of a [[12AT7]], V16.1, to clip a voltage derived from the mains transformer to a 100 V level divided from the regulated +225 V rail. | From SN 2406 upward, a dedicated calibrator stage uses one half of a [[12AT7]], V16.1, to clip a voltage derived from the mains transformer to a 100 V level divided from the regulated +225 V rail. | ||