kiphartzell
New member
What would cause a single diagonal line across the monitor? Background: I just received a replacement 25" Amplifone tube for my SW CP including a new purity mechanism. I swapped my yoke onto the new tube and installed the purity rings but have been unable to make any purity or convergence adjustments because I can't get the test screens to display on the monitor beyond a collapsed diagonal line. The deflection and HV cards have been rebuilt following Michael's FAQ including the recommended enhancements, but these cards are untested too because of the previous bad tube I had. I verified that the game board is generating the test screen using an X-Y O-scope (also, deflection led is out and I hear the normal deflection chatter). The X-size and Y-size pots will cause the diagonal line to grow in length, but doesn't change the collapse in either (both) directions. Also, the HV card has a Penntron HVT and is generating 19+KV. Anyone know what to look at next? Can a yoke or purity mechanism be that far off that it can cause this type of problem. Any reason to believe the tube may have an internal issue with the guns? I did test the tube before powering it on with my B&K 490 and everything checked out.