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Old 02-17-2023, 01:18 PM
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bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,803
Time for a long overdue update.
I tried a slow, variac power up and was able to get a bit of a raster plus a horrible hum out of the speaker.



The main filter cap was getting warm so I gave up on trying to reform and tacked in some replacement electrolytics for that can.

The side panel of the chassis come off allowing easy access. The chassis is quite well made for an off-brand.

Majestic was going through a bankruptcy around when this set was made. Wilcox-Gay bought up their assets so they may be responsible for the design.




Progress!


Replaced more a bunch of paper caps with little improvement. Finally, found a way out of spec resistor in the vertical hold circuit and got a lock.


Replacing the other electrolytic mostly fixed up that horizontal ringing.





I tested the caps afterwards and every section has very high leakage. Considering how baked the CRT is, I expect this is a high hour set.


Amazingly, I was able to boost emissions using 'Manual Restore 2' on a CR70. Enough that I was able to remove the booster and still have a good image.
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