Quote:
Originally Posted by Yamamaya42
I can't cout how many times I have done the convergence and purity dance. if i had to say, it's in the 100s  huge: |
Thats crazy huge!
Quote:
Originally Posted by Electronic M
Dynamic convergence tip: if the board is fine but it is pretty far off at all pot settings try moving the convergence yoke as much as 1/4" forward or rearward of it's designed position (over the end flare of the electron gun/or red dag ring if the gun is hidden). Sometimes The dynamic field overall is too strong or too weak and moving it fore/aft can act as a mechanical gain control. If the outer 1-2" radius is kinda lousy but looks decent from 15-20' viewing distance you may have optimized it. Perfect convergence to the edges on a roundy is a rare achievement.
Some focus ideas: there should be a ~3-6KV ceramic cap on the focus coil that may not be holding correct capacitance value. IIRC the 16 is tube focus rectification...I tend to switch most focus rects to modern SS HV diodes. Removing the filament load relieves the flyback, and tube focus rects are not always as stable as I like.
If you can get the HV cage open to look for arcing/corona that may help.
|
Ah! that's awesome to know! I may have to check that out and see how that changes things. But yeah, there is a few spots on that very outer 1-2'' that is lousy. but you can't really tell when tuned into a broadcast and does look great from 10 feet back. its impressive the quality of the picture on these older sets!
Indeed you remember correctly, it does have a tube rectifier. And I am up for helping out that flyback. I did notice the ma's surge over 300 for a very brief moment when the tv is first turned on. How hard is that to do solid state conversion?
I am not sure what I am looking for on the arching/corona. Do I need to do that check when the tv is running? I did notice that there was a static build up on the lead coming from the top of the hv cage. I did attach a few pictures of the flyback as well. I have a hunch that I am going to doing that flyback surgery to remove the rubber and do a silicon coating.
