Quote:
Originally Posted by DaveWM
I still have not tried the purity setup, I know that is suppose to be the 1st thing, guess I am just a bit nervous about pulling back the yoke.
I am still wondering if those diodes could be part of the issue. I have not studied the schematic, but if they are there to rectify the currend from the secondary of the vert output, and if they are weak, then maybe the magnetic field is not as strong as it should be. Again just guessing I reall dont have a clue as to what is going on in the convergence circuit.
Also have a real tough time with linearity, both vert and horz are way off.
I did not see a horz linearity adj, so figured I would start with checking the horz osc/damper/HOT for starters.
The vert is tough also cant get it to fill out the screen unless I mis adjust the vert linearity. I think maybe its a vert centering adj that needs to be done, to bring it all down 1st. Need to look over the set instructions again.
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Stop. Take a deep breath. Be patient. It will be good.
Convergence depends on multiple things being right. You should not (without lots of experience) try to do it out of order. Each adjustment interacts with the others. You must get purity first. That will put the yoke in the proper position as well. A slight movement either way may be just what you need to get the proper range on the convergence controls.
Then you do the static center convergence. This is what Phil was refering to by turning the blue magnet. You adjusted it and that helped, but you should pull the bar completely out of the assembly and turn it around 180 degres and reinsert it. That may help it bring blue back in range. When the center convergence is right none of the magnets should be at either end of their range. If they are you will have a hard time with dynamic convergence.
At this time go back and check purity. If it is still good move on. If it is off a little start over. Center convergence can impact purity, but not as much as purity affects center convergence.
When you do the dynamic convergence sometimes the lines will converge in the center, but not at the edges, or they will converge at the edges and center will be off. When this happens adjust the controls to make the lines straight. Then start over. Purity, then center convergence, then dynamic convergence. This sounds like a lot, but as you gain experience it will get easier. When you reach the point that it is as good as it will get and you still have issue with control range then start changing componants. The diodes first and any bad caps. Then start all over. Isn't this fun yet.
Now after saying all this, you said you are still having linerarity problems.
Linerarity, both vertical and horizontal, must be right before you do any dynamic convergence.
To adjust vertical you center the raster first using the vert center control, then use vert height and vert lin to adjust the top and bottom of the picture. I do not remember which control the top and which the bottom, I think the height adjument affects the bottom and the lin adjustment affects the top but it could be the other way around. You will need a crosshatch to do this. When it is correct all the squares will be the same size vertically. You may get the squares all the same size then notice that it doesn't fill the screen at the bottom. This indicates you still have a problem in the vertical output circuit. Usually a bad cap or out of spec resistor. If you do not have enough vertical sweep you will never get good convergence.
Horizontal linerarity is a function of the Horiz output and flyback circuits. Horiz efficency affects the width of the raster as well as the flyback current. The idea is to get sufficent width with the least Horizontal cathode current. If you have an acceptable HO cathode current, but the raster does not fill the screen you need to look for weak tubes, bad caps, and out of spec resistors in the Horizontal drive and output circuits. Try a new Horizontal output tube, since a tired tube may work but not fill the screen.
What you have is looking good. Be patient and good luck.
Bill R