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Howdy, and welcome.
I added the below blanking circuit to my 20A1 chassis about 15 years ago. Only one capacitor and a resistor, it really works well on my set. This is right out of Milton S. Kiver's-Television and F-M Receiver Servicing (great book by the way). The circuit shown is almost identical to your set. Hopefully you can see it well enough here, otherwise pm me and I can email a full size scan.
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