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Grundig W4/7 oscilloscope restoring Part One - Part Two - Part Three After the problem was identified, I've tried to source replacement caps. Today's caps are manufactured with capacity values different than before. This instrument is using the following ones: 50+50µF/385V - 2 pcs 40µF/385V 16µF/385V - 2 pcs 2.2µF/385V 500µF/4V Similar values were found, Low-ESR type, intended for elevated temperature surrounding of 105C. New caps, ready to be installed: 47µF/400V - 4 pieces 47µF/385V 15µF/400V - 2 pieces 2.2µF/385V 560µF/6.3V Single cap was removed at a time and replacement one soldered immediately. Such way of work reduces possible mistakes. Often is easier to cut away the wire close to a component then disturbing the soldering point. I've kept the original 50+50µF/385V caps disconnected but in place to preserve the chassis appearance. Modern electrolytics have reduced size, compared to old ones. I doubt they will last 40 years like their old relatives :-) Removed electrolytic caps were stored as exhibit for next generations. Part One - Part Two - Part Three Images (C) 2006 Tomislav Kordaso, 9A5TT