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560: Difference between revisions
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Mains power first passes through transformer T601, | Mains power first passes through transformer T601, | ||
which produces unregulated AC heater current and 170 Vrms for the second part of the power supply. | which produces unregulated AC heater current and 170 Vrms for the second part of the power supply. | ||
The second part is a regulated power oscillator operating at 25 kHz, using transformer T620. | The second part is a regulated Armstrong power oscillator operating at 25 kHz, using transformer T620. | ||
The secondary outputs of T620 are simply rectified and filtered, producing -12 VDC, +125 VDC, -100 VDC, | The secondary outputs of T620 are simply rectified and filtered, producing -12 VDC, +125 VDC, -100 VDC, | ||
and -3400 VDC. | and -3400 VDC. | ||
All regulation is performed by controlling the grid voltage on V620, the power oscillator tube. | All regulation is performed by controlling the screen grid voltage on V620, the power oscillator tube. | ||
In principle, the design used in the 560, which resembles a modern SMPS supply, | In principle, the design used in the 560, which resembles a modern SMPS supply, | ||