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The 6GH8 blanker and the 6LM8 video amp really need to be 100% in these chassis. Earlier Magnavoxs did use a 6GH8 in place of the 6LM8s. Also, unlike most all other brands, the brightness control on Magnavoxs has an effect on the set up service line adjustment. I always start with brightness, contrast, and kine bias controls tuned down. After set up and tweeking adjustments, if brightness is lacking check resistor R74, on the cathode of the 12GN7 ( shown on your post number 51). The resistor is usually underneath the tube socket on the foil side of the board. The diagram shows a 470 ohm, some sets used a 270 ohm. On sets needing more brightness range I replaced the 470 with a 270, made quite a difference.
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