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Well first off, does your version of the set have the 'color' switch? If so, what happens when you click the switch back and forth? And does yours have the TV-phono switch? If so, what happens with the sound if you click this switch between TV/phono?
On the hum thingy with brightness, try turning the vert. hold from stop to stop. Does the hum change frequency ('pitch') or remain constant? If it remains constant, this tells you it's not vert. sweep bleed-through. oc
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