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The AGC control should allow you to go from blank raster (no signal) to overloaded (negative picture with poor sync and buzz in sound) at full clockwise.
It may be an open control but what are the chances the set is producing a marginal picture and not one of those extremes?
That CR70 CRT tester should permit you to see the "cutoff" performance of the CRT, that is how well and linearly the control grid voltage G1 modulates the brightness, and by default, contrast.
Those coils between the 12BY7 and the CRT should be checked to see if one is open.
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"When resistors increase in value, they're worthless"
-Dave G
Last edited by DavGoodlin; 08-22-2017 at 12:28 PM.
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