Philco Issue

[VA561]

I have a philco tv model 50T-1404. I play the set for two hours at the most at some point during each weekend. The set plays great but has developed a peculiar issue when I first turn the set on. When first powered up (cold) the horizontal is out of adjustment. Regardless of which way I turn the adjustment knob I cannot get a picture. However, without fail, if I pull the plug and wait a few seconds and plug it back in, presto, I have a picture and everything is fine from then on. The horizontal width and linearity adjustments on the back of the set do not seem to have any effect when I turn them. Your expertise would be appreciated.