Finally found some spare time to install and adjust the new board.

First thing I have noticed is that the height of the pin header spacers were not  enough to provide clearance for the P2 jack.

To workaround that I have removed the spacers from other pin headers and stacked them on the top of the existing ones

The remaining length of the pins was enough to pass through the board and solder them in place

After that there was clearance enough to insert the P2 plug.

Nevertheless I should design another board using the original P2 jack, and enhance the centering of the output jack.

Adjustments

The adjustments went normal, as with the other board. I have used a program to produce all possible colors on the screen

10 CLS 5
20 FOR F = 0 TO 255
30 PRINT  CHR$(F);
40 NEXT F

• DUTY adjustment adjusts the amplitude of the color component in the signal, but the effect of the adjustment is marginal, at least on my LCD TV.
• AC amplitude should be adjusted to get close to 1Vpp with the video output loaded (connected to TV )
• DC amplitude should be adjusted to bring the BIAS DC level of the video signal the most close to zero. It is not possible to get the bottom of the pedestal at 0 Volts (let alone the black level). Nevertheless adjust the DC trimpot to the point where the sync tip starts to shrink

Results

The resulting image is nice, just like with the previous version of the board (which is just like expected as the schematics are the same.