I got it! I got it!

[avalon1308]

I think that the set except for the voltage and of course for the NTSC (3.58 MHz) to PAL(4.43 MHz) does not need to be modified a lot. 30 x 525=15750 versus 25 x 625=15625. The line frequency is very similar. The vertical oscillator has enough range to go down to 25 instead of 30. I have a few roundies in NTSC and the only problem I have is the magnetic field out of the transformer at 50 hertz influencing the 30 pics of the american system. It can make the picture a bit wobely. Just moving the step down transformer away from the set usually cures the problem. This will be ok since we have 25 pics/sec. Sound here is at 5.5 MHz away from picture. If I remember well, An old B/W set will work easily only by retuning the sound and adjusting the picture size without changing any components.