AC In My B-

[dtvmcdonald]

Oh yes: I've had problems with my TV-37 and only that set with sync problems due
to small amounts of hum on the signal itself, caused by poor gounding between the baseband signal source and my modulator, or caused by hum backing up onto the transmitting antenna if I am broadcasting across the room.

This is manifest by rolling hum dark hum bars in the picture and/or
loss of horizontal sync in rolling areas of the picture, typically 1/4 inch high. Its cured by getting all the grounds good in all the attached equipment.