Help please. HP 1725a, ebay purchase.
The CRT imaged appear brighter than real life due to camera response, the ghost is there at normal brightness.
Received with broken knobs and some badly remounted y amplifier PCB. Dismantled and cleaned the timebase switches, reassembled with all working OK. Left to soak test, just noticed a sudden brief brightening from the CRT in my peripheral vision. Since then I have a ghost around the CRT beam. This effect is most easily seen in x y mode.
All LV voltages are within spec with no ripple. 20V unregulated is at 23 VDC with some ripple as to be expected. Additional capacitance added to this line has no effect on CRT display. -3kV supply is present and correct.
Focus, astigmatism and pattern work as expected.
I am struggling with identifying some edge connector pin numbers and wire colour codes due to the poor quality of available downloaded manual. Does anyone have a good quality pdf copy of the manual - especially the circuit diagrams.
Also any clues as to possible cause? My current thinking is related to CRT voltages.
TIA