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To be more clear: Take the cap off the 6BK4, then run the set.
This will take the shunt regulator out of the circuit. By definition, the shunt regulator puts an additional load on a power supply of limited current availability. It relies on additional loading to provide voltage regulation. Think of the HV supply as providing enough voltage and current to run the picture tube. When the picture gets dark, beam current would go down, reducing load on the HV supply. Voltage would naturally go up. The 6BK4 should then conduct more, and load the HV supply source, and bring down the voltage level. Removing the HV lead, or plug at the end of the tube takes out the main current user of the HV supply, HV should go up as it has a very limited load at this time. Normally, the set should supply 20 - 25KV to your set with a mid brightness picture on the screen. You have to determine if the supply has a problem or if there is a problem with the tube, or the reg. It is fairly easy to disable the regulator. Then move on from there. Your tv sure looks like it's producing a nice bright picture. .
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Yes you can call me "Squirrel boy" Last edited by Username1; 03-05-2017 at 09:28 AM. |
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