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Take a look at the power plug for the tuner, namely pin 5, B+ source 2, this is sourced from 145v which also powers the V7 Sound Det, you have already seen how a faulty Sound Det can overload the 3rd IF and kill video, it is likely that this circuit is dependent on the tuner being connected for it to have the right load to have the correct voltage at the end of the string, w/o the tuner, the 130v goes too high and the Sound Det kills the 3rd IF, unhooking the tuner AGC line may also have an effect as well.
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11-11-2022, 10:45 AM
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