Thanks Alex!
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When you say video level varies straight at the Trinicon pickup tube,
did you measure at the preamp output (schematic of preamp photo #2)
or directly at the Trinicon's Target electrodes? (photo #1)
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Good spot, jhalphen.. I measured it at the preamp output (photo 2), not at the target. I'll definitely check out the pre-amplifier stage. thanks for the suggestion and for pinpointing that forum, and yes itīs a PAL camera
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Beyond that, I do not know enough to point to a specific cause, but since the problem occurs after the camera warms up, I would suggest using freeze spray to try to find a sensitive component.
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what a trick! never thought of that, thanks old_tv_nut. the file preview from google is heavily compressed but in the almost lossless downloadable .mov they are clearer, and yes I observed them in the non compressed video capture and in the viewfinder too, and heavier than those in that video