#18
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Quote:
I ended up modifying the cathode circuit on the 12BY7 because of the blooming problem. But the green cast at high brightness remained. I think there is more to do because to drive the CRT to conduct, the 12BY7 current remains too high. If I recall correctly, the 12BY7 control grid bias needs to increase (greater minus). Comparing the CTC5 to the CTC7 or CTC9 should reveal the difference. |
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