Quote:
Originally Posted by AmigaMan
... 1951 Zenith H2438 with a 24H20 chassis, which uses the 16GP4 metal cone CRT. . . . . it has a slight blip in the horizontal sweep, visible in the image as a vertical light line, around which the image is distorted, as if the sweep slows at that point in its horizontal travel.
|
Tom,
This was a very common problem with the early 1950's sets.
You either need to, or already have replaced the capacitor across your horizontal osc. coil and the new one is within 20 percent of the other one, but off just enough to throw the osc. wave form alignment out.
Get a Sams and adjust osc. coil to match the waveform pictures. (If you use a modern scope, adjust the time so you have at least 6 or 8 cycles on screen instead of the two shown in Sams.)
If you post a schematic of the sync and horiz circuits, I can verify this. (To the best of my memory from 50 years ago, these early Zenith sets use a sync/osc circuit similar to the same era RCA one.)
James