Finally, the CTC-7 is alive!

[cbenham]

Originally Posted by miniman82

On the CTC-9 when adjusting the horizontal efficiency coil, the reading on my meter would drop as I turned the slug inward then start to climb again after a certain point. In other words, there was a midpoint which gave the lowest overall reading, and on either side of that cathode current would begin to rise.

On the 7, I can twist the slug all the way in till it bottoms out and current is still falling. This would seem to indicate to me that either the coil does not have enough range to get to a low (best) indication on the meter, or there is something else amiss in the damper circuit.

The lowest current reading is the right setting and is also supposed to produce the best Horizontal linearity.

If you can't find a dip on the 7, look at replacing the resonating caps around the coil. Sometimes these have a 1500 volt rating.

Best Luck, Cliff