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RCA sent out a service tip about a modification to the sets without the VDR. Resistor R525, the 1000 ohm off of pin 5 of the 6CG7, is changed to a 560 ohm and R521, the 22k off of the horizontal hold control is lifted from ground and returned to pin 5 of the 6CG7. This change was made at the factory starting with the CTC-19 and 20 I think.
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