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On that model the resistor network is on the 9-181-02 main module(the big module sitting on the botom)I've saved them by removing from the board and carefully resoldering the pins where they connect up to the ceramic module.I saved the resistor network on my Advanced System 3 set's 9-214 module when it was turning blue.Where it is soldered on the board probably needs soldering anyway.If you find a heater-cathode short you don't have to buy a new CRT yet as long as your emission is good.They sell flyback operated brightener/isolation transformers.I've also made my own heater winding by wrapping a few turns of wire around the flyback core.The heater of the CRT must be isolated from ground if you have a heater -cathode short.Nearly all the later solid state tvs use grounded heater windings and when you get the short it grounds the cathode of the gun that has the short.
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