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Thanks Pete. I will go over the schematics for all three chassis to compare the video detector and first video stages. Perhaps the circuit in the article you have can work with the 4 if the output of the interface circuit can be matched to the 6CL6 1st video stage. It could be a rewarding project. Even though the 4 is narrow band, the color of the 21AX is super. I can't post a screen shot here, but can send one to your address if that's ok.
Kevin
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stromberg6
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