Quote:
Originally Posted by old_tv_nut
Alex, this is the first time I've heard of interference from video into audio at baseband. Very interesting.
The more common thing in older sets was sound buzz due to IF/sound misalignment - tends to occur when bright sharp details are present, like white letters.
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Really, very uncommon, in fact, but I testified some with that symptom in my life.
Since especially some audio IC's are prone to demodulating HF signals at input or feedback junctions (normally at inputs, due to lenght of needed traces). Strategically local input decoupling can help, also (eg. some ceramic cap to local audio ground at offending inputs). Not all sets follows good audio practices...