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you could also check the bias voltages at the blanking transistor (if the blanking pulse is incorrect per the scope). If the diode is good and the fly pulse is getting to the base of the transistor BUT the bias is incorrect, that would effect the gain of the transistor and upset the output at the emitter. The sams shows the pulses at both the base and emitter (which look the same) I presume to check that the transistor is working properly (if not it would be a defective transistor OR incorrect bias).
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