I have a new 9928, but nothing change in it, so both 9928 are ok,
thanks for the tip. i will try,
the pots in rf is one for audio and the other for fine tunning,
i think the problem is the VDP clock, is generated for 2x 7404 gates, and it uses a 2.7uh to generate the vdp clock, i dont have the 2.7uh to replace, im usisng 10uh, i will try to find one to see,
thanks for post,