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A very nice looking set you have Francesco. I wish we had better styling of sets from that ear here. In addition to replacement of electrolytics (most likely you will find no paper caps here) I would also look at the damper, horizontal output, high voltage rectifier and high voltage regulator tubes. Any of these would cause a dim blurry picture. Considering you still have a good black and white pictureI would say the picture tube is in good condition.
The most important thing to do after you re-cap the set and replace any weak tubes is to check the cathode current on the horizontal output tube. Most manufacturers have a disconnect-able lead to attach your meter to. around 200 milliamperes is a good value. Too high and it will damage the high-voltage transformer. The adjustment is usually labeled "Efficiency" or "Hor. Linerity" --just don't adjust it without your meter in circuit
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Jordan
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