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TV Engineer, thanks for that explanation - I forgot about audio carrier levels changing over the years - probably explains why I have trouble with my CTC-5 sound.
By the way, another reason for set top boxes to have 10% audio is that they sum the video and 4.5 Mhz intercarrier audio and then modulate onto the RF carrier, and the low audio intercarrier level helps prevent 920 kHz beat with the chroma.
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