Quote:
Originally Posted by Electronic M
Moving the yoke is for when things are badly out of range...Most procedures have you do the RG horiz and vert lines top and bottom first. I recently did a set where those would barely converge. The controls could barely achieve symmetrical mis-convergence (which consisted of bad mis-convergence over ~2/3 of the screen) moving the convergence yoke a bit got it to where I could converge it perfect to within 1" of the edge.
The SS upgrade consists of unplugging the tube, connecting a HV diode across the solder lugs on the underside of the socket banded end to cathode pin other end to plate pin...If you have a rect tube with an open heater you could put it in the socket for appearance. Putting two SS diodes in series for higher PIV tolerance may be advisable move...IIRC the upper focus voltage on some roundys is partway between 4 and 5KV so a single 5KV PIV rated diode may not have enough headroom. This probably will only knock less than 5mA off of H output cathode current.
In a dim or dark room with the HV cage open look for blue or purple glow inside the HV cage with the set running...The 16 and later RCAs did not make doing this easy with the way they mounted the rect into the lid.
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Thanks for all the help so far Tom! I sure appreciate it : )
Thats some helpful info on the yoke. This is my first color set I've ever played with. But it's really awesome and I've really enjoyed learning and fixing this set.
The solid state upgrade seems pretty easy to do. I could always clip the heater pins on the tube afterwards? I would like to keep it in for looks.
Yeah I was thinking it would be hard to have that open with the way that tube is mounted, then it just dawned on me that I drilled some holes in the top of the cage, so I should be able to see in there. I will fire up the set for another run this evening before I pull the chassis again and see if I see anything going on in there. Could that wax stuff in the top of the fly where the tube plugs into it cause the corona? And I wonder if having the HV turned down can prevent that, I wonder why the HV was turned down low.