88mph
Well-known member
Ok, here's a strange issue. I just picked up a Heathkit 5230 rejuvenator, and built a CR23 adaptor for it.
I plugged the rejuvenator into a known working tube on a monitor (Wells 4900) that was sitting around waiting for convergence. The rejuvenator was able to test all three guns, indicating that they are putting out the right amount of current.
Next I plugged the rejuveantor into the tube of another known working monitor--this time a 13 inch Electrohome GO7. The rejuvenator indicated that the heater was open. (The Heathkit indicates this by giving a false maximized heater voltage on the gauge, even if you haven't turned up the heater voltage at all. This rejuvenator gives the same response if you turn it on without plugging it into a tube.)
Next up, I took out my multimeter and tried measuring the resistance on the tube heater pins--9 and 10. I couldn't see any resistance on the tube on the GO7. (I was able to measure the correct resistance on the Wells.) I even got out my little spring loaded test leads to make sure I was getting a good connection on the little pins on the neck tube--still reading open.
I have since fired up the GO7 and it still works great--excellent picture and brightness. Try as I might, I can't get my multimeter to register a resistance across the heater pins--it always looks open. Something certainly isn't making sense here!
I plugged the rejuvenator into a known working tube on a monitor (Wells 4900) that was sitting around waiting for convergence. The rejuvenator was able to test all three guns, indicating that they are putting out the right amount of current.
Next I plugged the rejuveantor into the tube of another known working monitor--this time a 13 inch Electrohome GO7. The rejuvenator indicated that the heater was open. (The Heathkit indicates this by giving a false maximized heater voltage on the gauge, even if you haven't turned up the heater voltage at all. This rejuvenator gives the same response if you turn it on without plugging it into a tube.)
Next up, I took out my multimeter and tried measuring the resistance on the tube heater pins--9 and 10. I couldn't see any resistance on the tube on the GO7. (I was able to measure the correct resistance on the Wells.) I even got out my little spring loaded test leads to make sure I was getting a good connection on the little pins on the neck tube--still reading open.
I have since fired up the GO7 and it still works great--excellent picture and brightness. Try as I might, I can't get my multimeter to register a resistance across the heater pins--it always looks open. Something certainly isn't making sense here!