CTC 5 Low high voltage

[oldtvsandtoy]

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[Penthode]

Originally Posted by oldtvsandtoy

Would the -20 v take down the high voltage that much?

It is just that if the horizontal drive is low, then the resultant bias will also be low. That is because the bias is derived from the drive amplitude: eg a proper level drive will give higher bias. And the low drive would reduce the high voltage substantially.