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You're getting real close here but a tube is not causing what we see. That tuner may need to have its channel 3 and 4 strips cleaned off with alcohol. Clean plugs on the IF cable from the tuner also.
Then flip your $ervice $aver $et on its side, try a new 4mf-450 volt cap from pin 8 of the 12HL7 to ground. Contrast and video sharpness in general can be affected by this screen bypass cap AND tack in another 50 mf cap from the center post of the CONTRAST control to chassis. This has to do something positive here. Next try the electrolytic capacitor around the 6BA11's AGC section (pins 2 thru 8).
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"When resistors increase in value, they're worthless"
-Dave G
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