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The vertical pump up ckt, is a ckt that recovers what would otherwise be wasted energy from the yoke and adds it to the B+ supply for the ouptut ckt. This is claimed to lower the power needed for vertical deflection and such. Maybe it does. I recall in the old days of SS sets--some vertical ckts had HUGE sinks--probably 30 watts or such for the Vert. outputs, which ran in class A or PP-AB. . In the late '70's or so--they added a "retrace switch" transistor to the ckt, and this made it have a LOT lower dissipation and power draw. The RCA ctc-85 manual give a VERY good explanation of this Pump up" or "retrace boost" ckt. IIRC.
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02-17-2015, 09:03 AM
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