Re: CRT gain nonlinearity in a tek 556
|
I would look at the common mode voltages on the deflection plates and the geometry electrodes. I am guessing that they should be around 175V to minimize the fields in the gun structure. The gun components are likely to be 304 or 305 stainless, which can under some conditions at welds or other deformation can become magnetic. I have seen that occasionally, usually causing astigmatism problems.
Hugh Gilbert
John,
just a wild idea: would it be possible that something got magnetized in lower-beam structure of the tube?
Chris
|
