Filiment transformer insulation

[jr_tech]

I just measured the capacitance of a small 6.3 volt 2000 volt isolation transformer and found about 150 to 200 uuf between the 6.3 V winding and the primary and the core combined...
I would think that adding this extra capacitance to ground to the video output, which normally has to drive a much smaller capacitance, would reduce the frequency response, causing lack of sharpness of the display.

jr