I've been puttering around with the height problem, still seeking a solution. Height is 1/3 of the screen at most, and linearity is poor.
I wonder if the vertical output transformer could be funky?
I have subbed known-good 6DR7 vertical tubes, replaced the K4 and K5 vertical couplates, checked or replaced Rs and Cs around that tube. The pots for hold, height, and linearity are working and have the right resistance. The 400V boost voltage is normal. Here's a piece of the Sams schematic:
Voltages are close except that pin 7 (grid) is only -0.5 volts rather than -3.5. Resistance of the vertical windings on the yoke looks normal.
On the vertical output transformer, the secondary measures 2.6 ohms (expected 2.5) but the primary measures 410 ohms where it should be 425 (or 430 in the Philco schematic).
Could a few shorted turns in the output transformer account for the lack of height? I feel like I've eliminated just about everything else. This problem existed before I did any restoration.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html