After slowly bringing up the AC line voltage using a variable transformer, I checked for dead or gassy (bluish to purplish glow) and replaced them. Found 4 of them including the 1B3GT HV Rectifier. The power supply voltages were recorded as follow
SPECIFICATION PERRCA SERVICE MANUAL ACTUAL ON MY SET ERROR + 215 VDC + 222 VDC 7 V above + 135 VDC + 122 VDC 13 V below + 86 VDC + 78 VDC 8 V below - 66 VDC - 61 VDC 5 V above - 118 VDC - 128 VDC 10 V below - 120 VDC - 129 VDC 9 V below
After adjusting the ion trap, I did get a 2" X 6" raster but no recognizable picture. The raster was confined to only the center of the screen (a fuzzy broad line). I can see the vertical and horizontal bars. They can be adjusted which says the horizontal and vertical oscillators and sweep are running. Could not focus the picture and get a fine scan lines. I did get sound and after adjusting a couple of sound IF transformers picked up a local low power analog broadcast on channel 6. Suddenly the raster turned dim. When I turn the lights off I see a blue haze in the CRT gun section, indicating gassy. Ran the CRT tester on the 12LP4 picture tube and the tube failed the G2 voltage test. Had to replace the kinescope.
While waiting for a new kinescope, I checked the horizontal sweep. The Horizontal Sweep enters the Horizontal Output Tube (6BG6G) which supplies the high voltage to the Picture Tube by way of the horizontal output transformer and HV Rectifier. (1B3GT). Here is the sweep input to the Horizontal Output Tube 6BG6G pin 2:The time from the bottom of the sawtooth to the top (across) is 66 microseconds (or a frequency of 15750 Hertz). This represents the time needed for the electron beam to sweep across the picture tube. After some minor adjustments I was able to center the sawtooth around that important specification.