RCA 630TS Picture control

[Phil Nelson]

A pal kindly did an alignment of my RCA 630TS and both video and sound are greatly improved.

Question 1. Is the Picture control just a manual gain control?

Question 2. Is it normal for that control to peak around midrange, then go back down as you turn it farther in either direction? In other words, dark when fully counterclockwise, maximum picture around midrange, and dark when fully clockwise.

This set has been recapped and aligned, but that control behavior seems a little odd (most controls get "bigger" until you're fully clockwise). Should I check the Rs on that line?