Thanks Tom,
Just repeated my measurements with the 7603 frame.
2.5ns is more correct value (timebase calibration issue with fastest sweep and 10X). This corresponds to 140MHz.
I measured also frame 3dB bandwidth and got 140MHz.
7603+7A26 combination gave 3ns rise time (correct timebase).
7603+7A26 3dB bandwidth was 100-110 MHz. These gave 3ns rise time (correct timebase).
I am happy with the results. Now I have 4ch 100MHz ¡±old school¡± scope in my lab.
Regards,
Jouko
