This Hallicrafters 818 is only partially recapped, but all paper caps in the horizontal section and all electrolytics have been replaced. In the picture above it is receiving a nice strong signal at least audio wise, but the raster will not focus any sharper than what you see and even though it appears to be way off horizontal frequency, a multimeter connected to the oscillator shows the horizontal hold control varying the frequency to just below or just above spot on...yet there's no image whatsoever and what I am guessing are drive lines, but that's only a guess, i yield to the experts. What's my next step?